diff --git a/it0_app/android/app/src/main/AndroidManifest.xml b/it0_app/android/app/src/main/AndroidManifest.xml
index fab3e17..60f9981 100644
--- a/it0_app/android/app/src/main/AndroidManifest.xml
+++ b/it0_app/android/app/src/main/AndroidManifest.xml
@@ -1,6 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.RECORD_AUDIO"/>
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     <application
         android:usesCleartextTraffic="true"
         android:label="iAgent"
diff --git a/it0_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java b/it0_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
index 717c5fe..58bd2e8 100644
--- a/it0_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
+++ b/it0_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
@@ -15,11 +15,21 @@ import io.flutter.embedding.engine.FlutterEngine;
 public final class GeneratedPluginRegistrant {
   private static final String TAG = "GeneratedPluginRegistrant";
   public static void registerWith(@NonNull FlutterEngine flutterEngine) {
+    try {
+      flutterEngine.getPlugins().add(new com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin());
+    } catch (Exception e) {
+      Log.e(TAG, "Error registering plugin flutter_local_notifications, com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin", e);
+    }
     try {
       flutterEngine.getPlugins().add(new com.it_nomads.fluttersecurestorage.FlutterSecureStoragePlugin());
     } catch (Exception e) {
       Log.e(TAG, "Error registering plugin flutter_secure_storage, com.it_nomads.fluttersecurestorage.FlutterSecureStoragePlugin", e);
     }
+    try {
+      flutterEngine.getPlugins().add(new xyz.canardoux.fluttersound.FlutterSound());
+    } catch (Exception e) {
+      Log.e(TAG, "Error registering plugin flutter_sound, xyz.canardoux.fluttersound.FlutterSound", e);
+    }
     try {
       flutterEngine.getPlugins().add(new com.eyedeadevelopment.fluttertts.FlutterTtsPlugin());
     } catch (Exception e) {
diff --git a/it0_app/lib/app.dart b/it0_app/lib/app.dart
index f0218f7..150c9d6 100644
--- a/it0_app/lib/app.dart
+++ b/it0_app/lib/app.dart
@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'core/router/app_router.dart';
 import 'core/theme/app_theme.dart';
+import 'features/settings/presentation/providers/settings_providers.dart';
 
 class IT0App extends ConsumerWidget {
   const IT0App({super.key});
@@ -9,10 +10,13 @@ class IT0App extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final router = ref.watch(routerProvider);
+    final themeMode = ref.watch(themeModeProvider);
 
     return MaterialApp.router(
       title: 'iAgent',
-      theme: AppTheme.darkTheme,
+      theme: AppTheme.lightTheme,
+      darkTheme: AppTheme.darkTheme,
+      themeMode: themeMode,
       routerConfig: router,
       debugShowCheckedModeBanner: false,
     );
diff --git a/it0_app/lib/core/audio/pcm_player.dart b/it0_app/lib/core/audio/pcm_player.dart
new file mode 100644
index 0000000..6c87835
--- /dev/null
+++ b/it0_app/lib/core/audio/pcm_player.dart
@@ -0,0 +1,58 @@
+import 'dart:typed_data';
+import 'package:flutter_sound/flutter_sound.dart';
+
+/// Wraps [FlutterSoundPlayer] for streaming raw PCM 16kHz mono playback.
+///
+/// Usage:
+///   final player = PcmPlayer();
+///   await player.init();
+///   player.feed(pcmBytes);  // call repeatedly as data arrives
+///   await player.dispose();
+class PcmPlayer {
+  FlutterSoundPlayer? _player;
+  bool _initialized = false;
+
+  /// Open the player and start a streaming session.
+  Future<void> init() async {
+    if (_initialized) return;
+
+    _player = FlutterSoundPlayer();
+    await _player!.openPlayer();
+
+    await _player!.startPlayerFromStream(
+      codec: Codec.pcm16,
+      sampleRate: 16000,
+      numChannels: 1,
+      interleaved: false,
+      bufferSize: 8192,
+    );
+
+    _initialized = true;
+  }
+
+  /// Feed raw PCM 16-bit signed LE mono 16 kHz data for playback.
+  Future<void> feed(Uint8List pcmData) async {
+    if (!_initialized || _player == null) return;
+    // ignore: deprecated_member_use
+    await _player!.feedUint8FromStream(pcmData);
+  }
+
+  /// Toggle speaker mode (earpiece vs loudspeaker).
+  Future<void> setSpeakerOn(bool on) async {
+    // flutter_sound doesn't expose a direct speaker toggle;
+    // this would typically use audio_session or method channel.
+    // Placeholder for future platform-specific implementation.
+  }
+
+  /// Stop playback and release resources.
+  Future<void> dispose() async {
+    if (_player != null) {
+      try {
+        await _player!.stopPlayer();
+      } catch (_) {}
+      await _player!.closePlayer();
+      _player = null;
+    }
+    _initialized = false;
+  }
+}
diff --git a/it0_app/lib/core/config/api_endpoints.dart b/it0_app/lib/core/config/api_endpoints.dart
index 3fd8bca..d439f22 100644
--- a/it0_app/lib/core/config/api_endpoints.dart
+++ b/it0_app/lib/core/config/api_endpoints.dart
@@ -41,6 +41,13 @@ class ApiEndpoints {
   // Voice
   static const String transcribe = '$voice/transcribe';
 
+  // Admin Settings
+  static const String adminSettings = '/api/v1/admin/settings';
+  static const String adminAccount = '$adminSettings/account';
+  static const String adminAccountPassword = '$adminSettings/account/password';
+  static const String adminTheme = '$adminSettings/theme';
+  static const String adminNotifications = '$adminSettings/notifications';
+
   // WebSocket
   static const String wsTerminal = '/ws/terminal';
 }
diff --git a/it0_app/lib/core/router/app_router.dart b/it0_app/lib/core/router/app_router.dart
index db24be0..3322dd9 100644
--- a/it0_app/lib/core/router/app_router.dart
+++ b/it0_app/lib/core/router/app_router.dart
@@ -11,6 +11,7 @@ import '../../features/servers/presentation/pages/servers_page.dart';
 import '../../features/alerts/presentation/pages/alerts_page.dart';
 import '../../features/settings/presentation/pages/settings_page.dart';
 import '../../features/terminal/presentation/pages/terminal_page.dart';
+import '../../features/notifications/presentation/providers/notification_providers.dart';
 
 final routerProvider = Provider<GoRouter>((ref) {
   return GoRouter(
@@ -65,24 +66,41 @@ final routerProvider = Provider<GoRouter>((ref) {
   );
 });
 
-class ScaffoldWithNav extends StatelessWidget {
+class ScaffoldWithNav extends ConsumerWidget {
   final Widget child;
   const ScaffoldWithNav({super.key, required this.child});
 
   @override
-  Widget build(BuildContext context) {
+  Widget build(BuildContext context, WidgetRef ref) {
+    final unreadCount = ref.watch(unreadNotificationCountProvider);
+
     return Scaffold(
       body: child,
       bottomNavigationBar: NavigationBar(
-        destinations: const [
-          NavigationDestination(icon: Icon(Icons.dashboard), label: 'Dashboard'),
-          NavigationDestination(icon: Icon(Icons.chat), label: 'Chat'),
-          NavigationDestination(icon: Icon(Icons.task), label: 'Tasks'),
-          NavigationDestination(icon: Icon(Icons.notifications), label: 'Alerts'),
-          NavigationDestination(icon: Icon(Icons.settings), label: 'Settings'),
+        destinations: [
+          const NavigationDestination(
+              icon: Icon(Icons.dashboard), label: '仪表盘'),
+          const NavigationDestination(icon: Icon(Icons.chat), label: '对话'),
+          const NavigationDestination(icon: Icon(Icons.task), label: '任务'),
+          NavigationDestination(
+            icon: Badge(
+              isLabelVisible: unreadCount > 0,
+              label: Text('$unreadCount'),
+              child: const Icon(Icons.notifications),
+            ),
+            label: '告警',
+          ),
+          const NavigationDestination(
+              icon: Icon(Icons.settings), label: '设置'),
         ],
         onDestinationSelected: (index) {
-          final routes = ['/dashboard', '/chat', '/tasks', '/alerts', '/settings'];
+          final routes = [
+            '/dashboard',
+            '/chat',
+            '/tasks',
+            '/alerts',
+            '/settings'
+          ];
           GoRouter.of(context).go(routes[index]);
         },
       ),
diff --git a/it0_app/lib/core/services/notification_service.dart b/it0_app/lib/core/services/notification_service.dart
new file mode 100644
index 0000000..67cf19a
--- /dev/null
+++ b/it0_app/lib/core/services/notification_service.dart
@@ -0,0 +1,95 @@
+import 'dart:async';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:socket_io_client/socket_io_client.dart' as io;
+import '../../features/notifications/domain/entities/app_notification.dart';
+
+/// Service that connects to the comm-service Socket.IO gateway
+/// and displays local notifications for real-time push events.
+class NotificationService {
+  final String baseUrl;
+  final String? accessToken;
+  final FlutterLocalNotificationsPlugin _localNotifications;
+
+  io.Socket? _socket;
+  String? _tenantId;
+  final _controller = StreamController<AppNotification>.broadcast();
+  int _notificationId = 0;
+
+  NotificationService({
+    required this.baseUrl,
+    this.accessToken,
+    required FlutterLocalNotificationsPlugin localNotifications,
+  }) : _localNotifications = localNotifications;
+
+  /// Stream of incoming notifications.
+  Stream<AppNotification> get notifications => _controller.stream;
+
+  /// Connect to the comm-service WebSocket gateway.
+  void connect(String tenantId) {
+    _tenantId = tenantId;
+    disconnect();
+
+    _socket = io.io(
+      '$baseUrl/ws/comm',
+      io.OptionBuilder()
+          .setTransports(['websocket'])
+          .enableAutoConnect()
+          .setExtraHeaders(
+            accessToken != null
+                ? {'Authorization': 'Bearer $accessToken'}
+                : {},
+          )
+          .build(),
+    );
+
+    _socket!.onConnect((_) {
+      // Join the tenant room
+      _socket!.emit('join', {'room': 'tenant:$_tenantId'});
+    });
+
+    // Listen for notification events
+    _socket!.on('notification', (data) {
+      if (data is Map<String, dynamic>) {
+        final notification = AppNotification.fromJson(data);
+        _controller.add(notification);
+        _showLocalNotification(notification);
+      }
+    });
+
+    _socket!.onDisconnect((_) {});
+    _socket!.onConnectError((_) {});
+  }
+
+  /// Disconnect from the WebSocket gateway.
+  void disconnect() {
+    _socket?.dispose();
+    _socket = null;
+  }
+
+  /// Show a local notification on the device.
+  Future<void> _showLocalNotification(AppNotification notification) async {
+    const androidDetails = AndroidNotificationDetails(
+      'it0_notifications',
+      '运维通知',
+      channelDescription: 'iAgent 运维告警和通知',
+      importance: Importance.high,
+      priority: Priority.high,
+    );
+
+    const details = NotificationDetails(android: androidDetails);
+
+    await _localNotifications.show(
+      _notificationId++,
+      notification.title,
+      notification.body,
+      details,
+      payload: notification.actionRoute,
+    );
+  }
+
+  /// Clean up resources.
+  void dispose() {
+    disconnect();
+    _controller.close();
+  }
+}
diff --git a/it0_app/lib/core/theme/app_theme.dart b/it0_app/lib/core/theme/app_theme.dart
index 85f15ba..2281932 100644
--- a/it0_app/lib/core/theme/app_theme.dart
+++ b/it0_app/lib/core/theme/app_theme.dart
@@ -30,4 +30,34 @@ class AppTheme {
       ),
     ),
   );
+
+  static ThemeData get lightTheme => ThemeData(
+    brightness: Brightness.light,
+    useMaterial3: true,
+    colorScheme: ColorScheme.light(
+      primary: AppColors.primary,
+      secondary: AppColors.secondary,
+      surface: const Color(0xFFF8FAFC),
+      error: AppColors.error,
+    ),
+    scaffoldBackgroundColor: const Color(0xFFF1F5F9),
+    appBarTheme: const AppBarTheme(
+      backgroundColor: Colors.white,
+      elevation: 0,
+      foregroundColor: Color(0xFF1E293B),
+    ),
+    cardTheme: CardThemeData(
+      color: Colors.white,
+      elevation: 2,
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+    ),
+    inputDecorationTheme: InputDecorationTheme(
+      filled: true,
+      fillColor: const Color(0xFFF8FAFC),
+      border: OutlineInputBorder(
+        borderRadius: BorderRadius.circular(8),
+        borderSide: const BorderSide(color: Color(0xFFE2E8F0)),
+      ),
+    ),
+  );
 }
diff --git a/it0_app/lib/features/agent_call/data/repositories/voice_repository_impl.dart b/it0_app/lib/features/agent_call/data/repositories/voice_repository_impl.dart
index 4b44231..65a668f 100644
--- a/it0_app/lib/features/agent_call/data/repositories/voice_repository_impl.dart
+++ b/it0_app/lib/features/agent_call/data/repositories/voice_repository_impl.dart
@@ -21,7 +21,16 @@ class VoiceRepositoryImpl implements VoiceRepository {
     // If the backend didn't provide a WebSocket URL, construct one
     if (session.websocketUrl == null) {
       return session.copyWith(
-        websocketUrl: '${_config.wsBaseUrl}/ws/voice/${session.id}',
+        websocketUrl: '${_config.wsBaseUrl}/api/v1/voice/ws/${session.id}',
+      );
+    }
+
+    // If the backend returned a relative path, prepend the wsBaseUrl host
+    if (session.websocketUrl!.startsWith('/')) {
+      final uri = Uri.parse(_config.wsBaseUrl);
+      return session.copyWith(
+        websocketUrl:
+            '${uri.scheme}://${uri.host}:${uri.port}${session.websocketUrl}',
       );
     }
 
diff --git a/it0_app/lib/features/agent_call/presentation/pages/agent_call_page.dart b/it0_app/lib/features/agent_call/presentation/pages/agent_call_page.dart
index d45efe6..316cd52 100644
--- a/it0_app/lib/features/agent_call/presentation/pages/agent_call_page.dart
+++ b/it0_app/lib/features/agent_call/presentation/pages/agent_call_page.dart
@@ -3,16 +3,15 @@ import 'dart:math';
 import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:record/record.dart';
 import 'package:web_socket_channel/web_socket_channel.dart';
+import '../../../../core/audio/pcm_player.dart';
+import '../../../../core/audio/speech_enhancer.dart';
 import '../../../../core/config/api_endpoints.dart';
 import '../../../../core/config/app_config.dart';
 import '../../../../core/network/dio_client.dart';
 import '../../../../core/theme/app_colors.dart';
 
-// ---------------------------------------------------------------------------
-// TODO 42 – Agent call page: voice call with WebSocket audio streaming
-// ---------------------------------------------------------------------------
-
 /// Tracks the current state of the voice call.
 enum _CallPhase { ringing, connecting, active, ended }
 
@@ -27,28 +26,35 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
     with SingleTickerProviderStateMixin {
   _CallPhase _phase = _CallPhase.ringing;
   String? _sessionId;
-  String? _wsUrl;
   WebSocketChannel? _audioChannel;
   StreamSubscription? _audioSubscription;
 
+  // Audio capture
+  late final AudioRecorder _recorder;
+  final SpeechEnhancer _enhancer = SpeechEnhancer();
+  StreamSubscription<List<int>>? _micSubscription;
+
+  // Audio playback
+  final PcmPlayer _pcmPlayer = PcmPlayer();
+
   // Call duration
   final Stopwatch _stopwatch = Stopwatch();
   Timer? _durationTimer;
   String _durationLabel = '00:00';
 
-  // Waveform placeholder
+  // Waveform
   late AnimationController _waveController;
   final List<double> _waveHeights = List.generate(20, (_) => 0.3);
-  final _random = Random();
-  Timer? _waveTimer;
 
-  // Mute state
+  // Mute / speaker state
   bool _isMuted = false;
   bool _isSpeakerOn = false;
 
   @override
   void initState() {
     super.initState();
+    _recorder = AudioRecorder();
+    _enhancer.init();
     _waveController = AnimationController(
       vsync: this,
       duration: const Duration(milliseconds: 500),
@@ -59,40 +65,47 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
   // Call lifecycle
   // ---------------------------------------------------------------------------
 
-  /// Accept call: create voice session, get websocket_url, connect.
+  /// Accept call: create voice session, connect WebSocket, start mic + player.
   Future<void> _acceptCall() async {
     setState(() => _phase = _CallPhase.connecting);
 
     try {
       final dio = ref.read(dioClientProvider);
+      final config = ref.read(appConfigProvider);
       final response = await dio.post('${ApiEndpoints.voice}/sessions');
       final data = response.data as Map<String, dynamic>;
 
       _sessionId = data['id'] as String? ?? data['sessionId'] as String?;
-      _wsUrl = data['websocket_url'] as String? ?? data['ws_url'] as String?;
 
-      if (_wsUrl == null || _sessionId == null) {
-        // Construct the WS URL from config if the server didn't provide one
-        final config = ref.read(appConfigProvider);
-        _wsUrl ??= '${config.wsBaseUrl}/ws/voice/$_sessionId';
+      // Build WebSocket URL — prefer backend-returned path
+      String wsUrl;
+      final backendWsUrl =
+          data['websocket_url'] as String? ?? data['ws_url'] as String?;
+      if (backendWsUrl != null && backendWsUrl.startsWith('/')) {
+        // Relative path from backend — prepend wsBaseUrl host
+        final uri = Uri.parse(config.wsBaseUrl);
+        wsUrl = '${uri.scheme}://${uri.host}:${uri.port}$backendWsUrl';
+      } else if (backendWsUrl != null) {
+        wsUrl = backendWsUrl;
+      } else {
+        wsUrl = '${config.wsBaseUrl}/api/v1/voice/ws/$_sessionId';
       }
 
-      // Connect the audio WebSocket
-      _audioChannel = WebSocketChannel.connect(Uri.parse(_wsUrl!));
+      // Connect WebSocket
+      _audioChannel = WebSocketChannel.connect(Uri.parse(wsUrl));
 
-      // Listen for incoming audio data from the agent
+      // Listen for incoming audio from the agent
       _audioSubscription = _audioChannel!.stream.listen(
-        (data) {
-          _onAudioReceived(data);
-        },
+        (data) => _onAudioReceived(data),
         onDone: () => _onCallEnded(),
         onError: (_) => _onCallEnded(),
       );
 
-      // Start sending simulated mic audio (real implementation would use
-      // platform microphone via record/audio_session packages and stream
-      // PCM 16kHz chunks).
-      _startMicCapture();
+      // Initialize audio playback
+      await _pcmPlayer.init();
+
+      // Start mic capture
+      await _startMicCapture();
 
       // Start duration timer
       _stopwatch.start();
@@ -105,23 +118,14 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
         });
       });
 
-      // Animate waveform
       _waveController.repeat(reverse: true);
-      _waveTimer = Timer.periodic(const Duration(milliseconds: 120), (_) {
-        if (!mounted || _phase != _CallPhase.active) return;
-        setState(() {
-          for (int i = 0; i < _waveHeights.length; i++) {
-            _waveHeights[i] = 0.15 + _random.nextDouble() * 0.7;
-          }
-        });
-      });
 
       setState(() => _phase = _CallPhase.active);
     } catch (e) {
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(
-            content: Text('Failed to start call: $e'),
+            content: Text('通话连接失败: $e'),
             backgroundColor: AppColors.error,
           ),
         );
@@ -130,66 +134,105 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
     }
   }
 
-  /// Simulate microphone capture – in production this would use the `record`
-  /// package or platform channels to capture raw PCM 16kHz audio and stream it
-  /// over the WebSocket.
-  void _startMicCapture() {
-    // Placeholder: send a small silent PCM buffer every 100ms to keep the
-    // WebSocket alive. A real implementation would hook into the mic stream.
-    Timer.periodic(const Duration(milliseconds: 100), (timer) {
-      if (_phase != _CallPhase.active || _isMuted) {
-        if (_phase == _CallPhase.ended) timer.cancel();
-        return;
-      }
+  /// Start real microphone capture: record PCM 16kHz mono, denoise, send over WS.
+  Future<void> _startMicCapture() async {
+    final hasPermission = await _recorder.hasPermission();
+    if (!hasPermission) return;
+
+    final stream = await _recorder.startStream(const RecordConfig(
+      encoder: AudioEncoder.pcm16bits,
+      sampleRate: 16000,
+      numChannels: 1,
+      noiseSuppress: true,
+      autoGain: true,
+    ));
+
+    _micSubscription = stream.listen((chunk) {
+      if (_phase != _CallPhase.active || _isMuted) return;
       try {
-        // Send 16kHz * 0.1s * 2 bytes = 3200 bytes of silence
-        final silence = Uint8List(3200);
-        _audioChannel?.sink.add(silence);
-      } catch (_) {
-        timer.cancel();
-      }
+        // Denoise each chunk with GTCRN
+        final pcm = Uint8List.fromList(chunk);
+        final denoised = _enhancer.enhance(pcm);
+        _audioChannel?.sink.add(denoised);
+      } catch (_) {}
     });
   }
 
   /// Handle incoming audio from the agent side.
   void _onAudioReceived(dynamic data) {
-    // In a full implementation this would be piped to an audio player
-    // (e.g. flutter_sound or just_audio) for real-time playback.
-    // For now we simply trigger the waveform animation to indicate
-    // that audio data is being received.
     if (!mounted || _phase != _CallPhase.active) return;
+
+    Uint8List pcmData;
+    if (data is Uint8List) {
+      pcmData = data;
+    } else if (data is List<int>) {
+      pcmData = Uint8List.fromList(data);
+    } else {
+      return;
+    }
+
+    // Feed to player for real-time playback
+    _pcmPlayer.feed(pcmData);
+
+    // Drive waveform from actual audio energy (RMS)
+    _updateWaveform(pcmData);
+  }
+
+  /// Calculate RMS from PCM data and update waveform bars.
+  void _updateWaveform(Uint8List pcmData) {
+    if (pcmData.length < 4) return;
+    final byteData = ByteData.sublistView(pcmData);
+    final sampleCount = pcmData.length ~/ 2;
+
+    // Compute overall RMS
+    double sum = 0;
+    for (int i = 0; i < sampleCount; i++) {
+      final s = byteData.getInt16(i * 2, Endian.little).toDouble();
+      sum += s * s;
+    }
+    final rms = sqrt(sum / sampleCount) / 32768.0; // normalize to [0,1]
+
     setState(() {
+      final rand = Random();
       for (int i = 0; i < _waveHeights.length; i++) {
-        _waveHeights[i] = 0.2 + _random.nextDouble() * 0.8;
+        _waveHeights[i] =
+            (rms * 2.0 + rand.nextDouble() * 0.2).clamp(0.1, 1.0);
       }
     });
   }
 
-  /// End the call and clean up resources.
+  /// End the call and clean up all resources.
   Future<void> _endCall() async {
     setState(() => _phase = _CallPhase.ended);
     _stopwatch.stop();
     _durationTimer?.cancel();
-    _waveTimer?.cancel();
     _waveController.stop();
-    _audioSubscription?.cancel();
 
+    // Stop mic
+    await _micSubscription?.cancel();
+    _micSubscription = null;
+    try {
+      await _recorder.stop();
+    } catch (_) {}
+
+    // Stop playback
+    await _pcmPlayer.dispose();
+
+    // Close WebSocket
+    _audioSubscription?.cancel();
     try {
       await _audioChannel?.sink.close();
     } catch (_) {}
 
-    // Delete the voice session on the server
+    // Delete voice session on the server
     if (_sessionId != null) {
       try {
         final dio = ref.read(dioClientProvider);
         await dio.delete('${ApiEndpoints.voice}/sessions/$_sessionId');
-      } catch (_) {
-        // Best-effort cleanup
-      }
+      } catch (_) {}
     }
 
     if (mounted) {
-      // Brief delay so the user sees "Call ended" before popping
       await Future.delayed(const Duration(seconds: 1));
       if (mounted) Navigator.of(context).pop();
     }
@@ -212,25 +255,20 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
         child: Column(
           children: [
             const Spacer(flex: 2),
-
-            // Agent avatar / icon
             _buildAvatar(),
             const SizedBox(height: 24),
-
-            // Status text
             Text(
               _statusText,
-              style: const TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
+              style:
+                  const TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
             ),
             const SizedBox(height: 8),
             Text(
               _subtitleText,
-              style: const TextStyle(color: AppColors.textSecondary, fontSize: 15),
+              style: const TextStyle(
+                  color: AppColors.textSecondary, fontSize: 15),
             ),
-
             const SizedBox(height: 32),
-
-            // Duration
             if (_phase == _CallPhase.active)
               Text(
                 _durationLabel,
@@ -241,15 +279,9 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
                   letterSpacing: 4,
                 ),
               ),
-
             const SizedBox(height: 24),
-
-            // Waveform visualization placeholder
             if (_phase == _CallPhase.active) _buildWaveform(),
-
             const Spacer(flex: 3),
-
-            // Control buttons
             _buildControls(),
             const SizedBox(height: 48),
           ],
@@ -261,24 +293,24 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
   String get _statusText {
     switch (_phase) {
       case _CallPhase.ringing:
-        return 'iAgent Calling';
+        return 'iAgent 语音通话';
       case _CallPhase.connecting:
-        return 'Connecting...';
+        return '连接中...';
       case _CallPhase.active:
         return 'iAgent';
       case _CallPhase.ended:
-        return 'Call Ended';
+        return '通话结束';
     }
   }
 
   String get _subtitleText {
     switch (_phase) {
       case _CallPhase.ringing:
-        return 'Incoming voice call';
+        return '智能运维语音助手';
       case _CallPhase.connecting:
-        return 'Setting up secure channel';
+        return '正在建立安全连接';
       case _CallPhase.active:
-        return 'Voice call in progress';
+        return '语音通话中';
       case _CallPhase.ended:
         return _durationLabel;
     }
@@ -327,7 +359,8 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
             height: 10 + _waveHeights[i] * 50,
             margin: const EdgeInsets.symmetric(horizontal: 2),
             decoration: BoxDecoration(
-              color: AppColors.primary.withOpacity(0.6 + _waveHeights[i] * 0.4),
+              color: AppColors.primary
+                  .withOpacity(0.6 + _waveHeights[i] * 0.4),
               borderRadius: BorderRadius.circular(2),
             ),
           );
@@ -342,7 +375,6 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
         return Row(
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
-            // Decline
             FloatingActionButton(
               heroTag: 'decline',
               backgroundColor: AppColors.error,
@@ -350,7 +382,6 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
               child: const Icon(Icons.call_end, color: Colors.white),
             ),
             const SizedBox(width: 40),
-            // Accept
             FloatingActionButton(
               heroTag: 'accept',
               backgroundColor: AppColors.success,
@@ -367,15 +398,13 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
         return Row(
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
-            // Mute
             _CircleButton(
               icon: _isMuted ? Icons.mic_off : Icons.mic,
-              label: _isMuted ? 'Unmute' : 'Mute',
+              label: _isMuted ? '取消静音' : '静音',
               isActive: _isMuted,
               onTap: () => setState(() => _isMuted = !_isMuted),
             ),
             const SizedBox(width: 24),
-            // End call
             FloatingActionButton(
               heroTag: 'end',
               backgroundColor: AppColors.error,
@@ -383,29 +412,35 @@ class _AgentCallPageState extends ConsumerState<AgentCallPage>
               child: const Icon(Icons.call_end, color: Colors.white),
             ),
             const SizedBox(width: 24),
-            // Speaker
             _CircleButton(
               icon: _isSpeakerOn ? Icons.volume_up : Icons.volume_down,
-              label: 'Speaker',
+              label: '扬声器',
               isActive: _isSpeakerOn,
-              onTap: () => setState(() => _isSpeakerOn = !_isSpeakerOn),
+              onTap: () {
+                setState(() => _isSpeakerOn = !_isSpeakerOn);
+                _pcmPlayer.setSpeakerOn(_isSpeakerOn);
+              },
             ),
           ],
         );
 
       case _CallPhase.ended:
-        return const Icon(Icons.call_end, size: 48, color: AppColors.textMuted);
+        return const Icon(Icons.call_end,
+            size: 48, color: AppColors.textMuted);
     }
   }
 
   @override
   void dispose() {
     _durationTimer?.cancel();
-    _waveTimer?.cancel();
     _waveController.dispose();
     _stopwatch.stop();
+    _micSubscription?.cancel();
+    _recorder.dispose();
+    _enhancer.dispose();
     _audioSubscription?.cancel();
     _audioChannel?.sink.close();
+    _pcmPlayer.dispose();
     super.dispose();
   }
 }
@@ -449,7 +484,8 @@ class _CircleButton extends StatelessWidget {
         const SizedBox(height: 6),
         Text(
           label,
-          style: const TextStyle(color: AppColors.textSecondary, fontSize: 11),
+          style:
+              const TextStyle(color: AppColors.textSecondary, fontSize: 11),
         ),
       ],
     );
diff --git a/it0_app/lib/features/auth/data/models/auth_response.dart b/it0_app/lib/features/auth/data/models/auth_response.dart
index a7a8dc5..3b36e46 100644
--- a/it0_app/lib/features/auth/data/models/auth_response.dart
+++ b/it0_app/lib/features/auth/data/models/auth_response.dart
@@ -23,12 +23,14 @@ class AuthUser {
   final String email;
   final String name;
   final List<String> roles;
+  final String? tenantId;
 
   const AuthUser({
     required this.id,
     required this.email,
     required this.name,
     required this.roles,
+    this.tenantId,
   });
 
   factory AuthUser.fromJson(Map<String, dynamic> json) {
@@ -37,6 +39,7 @@ class AuthUser {
       email: json['email'] as String,
       name: json['name'] as String,
       roles: (json['roles'] as List).cast<String>(),
+      tenantId: json['tenantId'] as String?,
     );
   }
 }
diff --git a/it0_app/lib/features/auth/data/providers/auth_provider.dart b/it0_app/lib/features/auth/data/providers/auth_provider.dart
index ef28cf1..e61af19 100644
--- a/it0_app/lib/features/auth/data/providers/auth_provider.dart
+++ b/it0_app/lib/features/auth/data/providers/auth_provider.dart
@@ -1,9 +1,12 @@
+import 'dart:async';
 import 'package:dio/dio.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import '../../../../core/config/api_endpoints.dart';
 import '../../../../core/config/app_config.dart';
+import '../../../notifications/presentation/providers/notification_providers.dart';
 import '../models/auth_response.dart';
+import 'tenant_provider.dart';
 
 const _keyAccessToken = 'access_token';
 const _keyRefreshToken = 'refresh_token';
@@ -52,6 +55,7 @@ class AuthState {
 
 class AuthNotifier extends StateNotifier<AuthState> {
   final Ref _ref;
+  StreamSubscription? _notificationSubscription;
 
   AuthNotifier(this._ref) : super(const AuthState());
 
@@ -71,7 +75,8 @@ class AuthNotifier extends StateNotifier<AuthState> {
           AuthResponse.fromJson(response.data as Map<String, dynamic>);
 
       final storage = _ref.read(secureStorageProvider);
-      await storage.write(key: _keyAccessToken, value: authResponse.accessToken);
+      await storage.write(
+          key: _keyAccessToken, value: authResponse.accessToken);
       await storage.write(
           key: _keyRefreshToken, value: authResponse.refreshToken);
 
@@ -82,6 +87,16 @@ class AuthNotifier extends StateNotifier<AuthState> {
       );
 
       _ref.invalidate(accessTokenProvider);
+
+      // Set tenant context for all subsequent API calls
+      if (authResponse.user.tenantId != null) {
+        _ref.read(currentTenantIdProvider.notifier).state =
+            authResponse.user.tenantId;
+      }
+
+      // Connect notification service after login
+      _connectNotifications(authResponse.user.tenantId);
+
       return true;
     } on DioException catch (e) {
       final message =
@@ -101,6 +116,14 @@ class AuthNotifier extends StateNotifier<AuthState> {
   }
 
   Future<void> logout() async {
+    // Disconnect notification service
+    _notificationSubscription?.cancel();
+    _notificationSubscription = null;
+    _ref.read(notificationServiceProvider).disconnect();
+
+    // Clear tenant context
+    _ref.read(currentTenantIdProvider.notifier).state = null;
+
     final storage = _ref.read(secureStorageProvider);
     await storage.delete(key: _keyAccessToken);
     await storage.delete(key: _keyRefreshToken);
@@ -135,4 +158,22 @@ class AuthNotifier extends StateNotifier<AuthState> {
       return false;
     }
   }
+
+  void _connectNotifications(String? tenantId) {
+    if (tenantId == null) return;
+    try {
+      final notificationService = _ref.read(notificationServiceProvider);
+      final notificationList = _ref.read(notificationListProvider.notifier);
+
+      notificationService.connect(tenantId);
+
+      // Forward incoming notifications to the list
+      _notificationSubscription =
+          notificationService.notifications.listen((notification) {
+        notificationList.add(notification);
+      });
+    } catch (_) {
+      // Non-critical — app works without push notifications
+    }
+  }
 }
diff --git a/it0_app/lib/features/notifications/domain/entities/app_notification.dart b/it0_app/lib/features/notifications/domain/entities/app_notification.dart
new file mode 100644
index 0000000..88f828c
--- /dev/null
+++ b/it0_app/lib/features/notifications/domain/entities/app_notification.dart
@@ -0,0 +1,48 @@
+/// Represents a push notification received from the backend.
+class AppNotification {
+  final String id;
+  final String type; // alert, approval, task_complete, message
+  final String title;
+  final String body;
+  final String? actionRoute; // deep link path, e.g. '/alerts'
+  final DateTime receivedAt;
+  final bool isRead;
+
+  const AppNotification({
+    required this.id,
+    required this.type,
+    required this.title,
+    required this.body,
+    this.actionRoute,
+    required this.receivedAt,
+    this.isRead = false,
+  });
+
+  AppNotification copyWith({bool? isRead}) {
+    return AppNotification(
+      id: id,
+      type: type,
+      title: title,
+      body: body,
+      actionRoute: actionRoute,
+      receivedAt: receivedAt,
+      isRead: isRead ?? this.isRead,
+    );
+  }
+
+  factory AppNotification.fromJson(Map<String, dynamic> json) {
+    return AppNotification(
+      id: json['id'] as String? ?? DateTime.now().millisecondsSinceEpoch.toString(),
+      type: json['type'] as String? ?? 'message',
+      title: json['title'] as String? ?? json['content'] as String? ?? '',
+      body: json['body'] as String? ?? json['content'] as String? ?? '',
+      actionRoute: json['actionRoute'] as String?,
+      receivedAt: json['receivedAt'] != null
+          ? DateTime.parse(json['receivedAt'] as String)
+          : (json['sentAt'] != null
+              ? DateTime.parse(json['sentAt'] as String)
+              : DateTime.now()),
+      isRead: json['isRead'] as bool? ?? false,
+    );
+  }
+}
diff --git a/it0_app/lib/features/notifications/presentation/providers/notification_providers.dart b/it0_app/lib/features/notifications/presentation/providers/notification_providers.dart
new file mode 100644
index 0000000..f29736c
--- /dev/null
+++ b/it0_app/lib/features/notifications/presentation/providers/notification_providers.dart
@@ -0,0 +1,57 @@
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../../../../core/config/app_config.dart';
+import '../../../../core/services/notification_service.dart';
+import '../../domain/entities/app_notification.dart';
+
+/// Global local notifications plugin instance (initialized in main.dart).
+final localNotificationsPluginProvider =
+    Provider<FlutterLocalNotificationsPlugin>((ref) {
+  return FlutterLocalNotificationsPlugin();
+});
+
+/// Notification service singleton.
+final notificationServiceProvider = Provider<NotificationService>((ref) {
+  final config = ref.watch(appConfigProvider);
+  final plugin = ref.watch(localNotificationsPluginProvider);
+  return NotificationService(
+    baseUrl: config.apiBaseUrl,
+    localNotifications: plugin,
+  );
+});
+
+/// Accumulated notification list.
+class NotificationListNotifier extends StateNotifier<List<AppNotification>> {
+  NotificationListNotifier() : super([]);
+
+  void add(AppNotification notification) {
+    state = [notification, ...state];
+  }
+
+  void markRead(String id) {
+    state = state.map((n) {
+      if (n.id == id) return n.copyWith(isRead: true);
+      return n;
+    }).toList();
+  }
+
+  void markAllRead() {
+    state = state.map((n) => n.copyWith(isRead: true)).toList();
+  }
+
+  void clear() {
+    state = [];
+  }
+}
+
+final notificationListProvider =
+    StateNotifierProvider<NotificationListNotifier, List<AppNotification>>(
+        (ref) {
+  return NotificationListNotifier();
+});
+
+/// Unread notification count.
+final unreadNotificationCountProvider = Provider<int>((ref) {
+  final notifications = ref.watch(notificationListProvider);
+  return notifications.where((n) => !n.isRead).length;
+});
diff --git a/it0_app/lib/features/settings/data/datasources/settings_remote_datasource.dart b/it0_app/lib/features/settings/data/datasources/settings_remote_datasource.dart
new file mode 100644
index 0000000..bb744de
--- /dev/null
+++ b/it0_app/lib/features/settings/data/datasources/settings_remote_datasource.dart
@@ -0,0 +1,40 @@
+import 'package:dio/dio.dart';
+import '../../../../core/config/api_endpoints.dart';
+
+/// Remote datasource for account settings against the IT0 backend API.
+class SettingsRemoteDatasource {
+  final Dio _dio;
+
+  SettingsRemoteDatasource(this._dio);
+
+  /// Fetches the current user's account info (displayName, email).
+  Future<Map<String, dynamic>> getAccount() async {
+    final response = await _dio.get(ApiEndpoints.adminAccount);
+    return response.data as Map<String, dynamic>;
+  }
+
+  /// Updates the current user's display name.
+  Future<Map<String, dynamic>> updateAccount(String displayName) async {
+    final response = await _dio.put(
+      ApiEndpoints.adminAccount,
+      data: {'displayName': displayName},
+    );
+    return response.data as Map<String, dynamic>;
+  }
+
+  /// Changes the current user's password.
+  /// Returns `{success: true}` or `{success: false, message: ...}`.
+  Future<Map<String, dynamic>> changePassword({
+    required String currentPassword,
+    required String newPassword,
+  }) async {
+    final response = await _dio.put(
+      ApiEndpoints.adminAccountPassword,
+      data: {
+        'currentPassword': currentPassword,
+        'newPassword': newPassword,
+      },
+    );
+    return response.data as Map<String, dynamic>;
+  }
+}
diff --git a/it0_app/lib/features/settings/presentation/pages/settings_page.dart b/it0_app/lib/features/settings/presentation/pages/settings_page.dart
index 2535c91..4298384 100644
--- a/it0_app/lib/features/settings/presentation/pages/settings_page.dart
+++ b/it0_app/lib/features/settings/presentation/pages/settings_page.dart
@@ -2,68 +2,313 @@ import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import '../../../auth/data/providers/auth_provider.dart';
+import '../providers/settings_providers.dart';
 
-class SettingsPage extends ConsumerWidget {
+class SettingsPage extends ConsumerStatefulWidget {
   const SettingsPage({super.key});
 
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  ConsumerState<SettingsPage> createState() => _SettingsPageState();
+}
+
+class _SettingsPageState extends ConsumerState<SettingsPage> {
+  @override
+  void initState() {
+    super.initState();
+    Future.microtask(() {
+      ref.read(accountProfileProvider.notifier).loadProfile();
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final settings = ref.watch(settingsProvider);
+    final profile = ref.watch(accountProfileProvider);
+    final theme = Theme.of(context);
+
     return Scaffold(
-      appBar: AppBar(title: const Text('Settings')),
+      appBar: AppBar(title: const Text('设置')),
       body: ListView(
+        padding: const EdgeInsets.symmetric(vertical: 8),
         children: [
-          const ListTile(
-            leading: Icon(Icons.person),
-            title: Text('Profile'),
-            trailing: Icon(Icons.chevron_right),
+          // --- Profile Section ---
+          _SectionHeader(title: '个人信息'),
+          ListTile(
+            leading: CircleAvatar(
+              backgroundColor: theme.colorScheme.primary,
+              child: Text(
+                profile.displayName.isNotEmpty
+                    ? profile.displayName[0].toUpperCase()
+                    : '?',
+                style: const TextStyle(
+                    color: Colors.white, fontWeight: FontWeight.bold),
+              ),
+            ),
+            title: Text(
+              profile.displayName.isNotEmpty ? profile.displayName : '加载中...',
+            ),
+            subtitle: Text(profile.email),
+            trailing: IconButton(
+              icon: const Icon(Icons.edit),
+              onPressed: () => _showEditNameDialog(profile.displayName),
+            ),
           ),
-          const ListTile(
-            leading: Icon(Icons.business),
-            title: Text('Tenant'),
-            trailing: Icon(Icons.chevron_right),
-          ),
-          const ListTile(
-            leading: Icon(Icons.notifications),
-            title: Text('Notifications'),
-            trailing: Icon(Icons.chevron_right),
-          ),
-          const ListTile(
-            leading: Icon(Icons.color_lens),
-            title: Text('Theme'),
-            trailing: Icon(Icons.chevron_right),
+          ListTile(
+            leading: const Icon(Icons.lock_outline),
+            title: const Text('修改密码'),
+            trailing: const Icon(Icons.chevron_right),
+            onTap: _showChangePasswordSheet,
           ),
           const Divider(),
+
+          // --- Appearance Section ---
+          _SectionHeader(title: '外观'),
+          Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+            child: SegmentedButton<ThemeMode>(
+              segments: const [
+                ButtonSegment(
+                    value: ThemeMode.dark,
+                    label: Text('深色'),
+                    icon: Icon(Icons.dark_mode)),
+                ButtonSegment(
+                    value: ThemeMode.light,
+                    label: Text('浅色'),
+                    icon: Icon(Icons.light_mode)),
+                ButtonSegment(
+                    value: ThemeMode.system,
+                    label: Text('跟随系统'),
+                    icon: Icon(Icons.settings_brightness)),
+              ],
+              selected: {settings.themeMode},
+              onSelectionChanged: (modes) {
+                ref.read(settingsProvider.notifier).setThemeMode(modes.first);
+              },
+            ),
+          ),
+          const Divider(),
+
+          // --- Notifications Section ---
+          _SectionHeader(title: '通知'),
+          SwitchListTile(
+            secondary: const Icon(Icons.notifications_outlined),
+            title: const Text('推送通知'),
+            value: settings.notificationsEnabled,
+            onChanged: (v) {
+              ref.read(settingsProvider.notifier).setNotificationsEnabled(v);
+            },
+          ),
+          SwitchListTile(
+            secondary: const Icon(Icons.volume_up_outlined),
+            title: const Text('提示音'),
+            value: settings.soundEnabled,
+            onChanged: settings.notificationsEnabled
+                ? (v) => ref.read(settingsProvider.notifier).setSoundEnabled(v)
+                : null,
+          ),
+          SwitchListTile(
+            secondary: const Icon(Icons.vibration),
+            title: const Text('震动反馈'),
+            value: settings.hapticFeedback,
+            onChanged: settings.notificationsEnabled
+                ? (v) =>
+                    ref.read(settingsProvider.notifier).setHapticFeedback(v)
+                : null,
+          ),
+          const Divider(),
+
+          // --- About Section ---
+          _SectionHeader(title: '关于'),
+          const ListTile(
+            leading: Icon(Icons.info_outline),
+            title: Text('应用版本'),
+            subtitle: Text('iAgent v1.0.0'),
+          ),
+          if (settings.selectedTenantName != null)
+            ListTile(
+              leading: const Icon(Icons.business),
+              title: const Text('租户'),
+              subtitle: Text(settings.selectedTenantName!),
+            ),
+          const Divider(),
+
+          // --- Logout ---
           ListTile(
             leading: const Icon(Icons.logout, color: Colors.red),
-            title: const Text('Logout', style: TextStyle(color: Colors.red)),
-            onTap: () async {
-              final confirmed = await showDialog<bool>(
-                context: context,
-                builder: (ctx) => AlertDialog(
-                  title: const Text('Logout'),
-                  content: const Text('Are you sure you want to logout?'),
-                  actions: [
-                    TextButton(
-                      onPressed: () => Navigator.of(ctx).pop(false),
-                      child: const Text('Cancel'),
-                    ),
-                    FilledButton(
-                      onPressed: () => Navigator.of(ctx).pop(true),
-                      child: const Text('Logout'),
-                    ),
-                  ],
-                ),
-              );
-              if (confirmed == true) {
-                await ref.read(authStateProvider.notifier).logout();
-                if (context.mounted) {
-                  context.go('/login');
-                }
+            title:
+                const Text('退出登录', style: TextStyle(color: Colors.red)),
+            onTap: () => _confirmLogout(),
+          ),
+          const SizedBox(height: 32),
+        ],
+      ),
+    );
+  }
+
+  void _showEditNameDialog(String currentName) {
+    final controller = TextEditingController(text: currentName);
+    showDialog(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('修改显示名称'),
+        content: TextField(
+          controller: controller,
+          autofocus: true,
+          decoration: const InputDecoration(
+            labelText: '显示名称',
+            hintText: '输入新的显示名称',
+          ),
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(ctx).pop(),
+            child: const Text('取消'),
+          ),
+          FilledButton(
+            onPressed: () async {
+              final name = controller.text.trim();
+              if (name.isEmpty) return;
+              Navigator.of(ctx).pop();
+              final success = await ref
+                  .read(accountProfileProvider.notifier)
+                  .updateDisplayName(name);
+              if (mounted) {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  SnackBar(
+                    content: Text(success ? '名称已更新' : '更新失败'),
+                  ),
+                );
               }
             },
+            child: const Text('保存'),
           ),
         ],
       ),
     );
   }
+
+  void _showChangePasswordSheet() {
+    final currentCtrl = TextEditingController();
+    final newCtrl = TextEditingController();
+    final confirmCtrl = TextEditingController();
+
+    showModalBottomSheet(
+      context: context,
+      isScrollControlled: true,
+      builder: (ctx) => Padding(
+        padding: EdgeInsets.fromLTRB(
+          24,
+          24,
+          24,
+          MediaQuery.of(ctx).viewInsets.bottom + 24,
+        ),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            Text('修改密码', style: Theme.of(ctx).textTheme.titleLarge),
+            const SizedBox(height: 16),
+            TextField(
+              controller: currentCtrl,
+              obscureText: true,
+              decoration: const InputDecoration(labelText: '当前密码'),
+            ),
+            const SizedBox(height: 12),
+            TextField(
+              controller: newCtrl,
+              obscureText: true,
+              decoration: const InputDecoration(labelText: '新密码'),
+            ),
+            const SizedBox(height: 12),
+            TextField(
+              controller: confirmCtrl,
+              obscureText: true,
+              decoration: const InputDecoration(labelText: '确认新密码'),
+            ),
+            const SizedBox(height: 20),
+            FilledButton(
+              onPressed: () async {
+                if (newCtrl.text != confirmCtrl.text) {
+                  ScaffoldMessenger.of(context).showSnackBar(
+                    const SnackBar(content: Text('两次输入的密码不一致')),
+                  );
+                  return;
+                }
+                if (newCtrl.text.length < 6) {
+                  ScaffoldMessenger.of(context).showSnackBar(
+                    const SnackBar(content: Text('新密码至少6个字符')),
+                  );
+                  return;
+                }
+                Navigator.of(ctx).pop();
+                final result = await ref
+                    .read(accountProfileProvider.notifier)
+                    .changePassword(
+                      currentPassword: currentCtrl.text,
+                      newPassword: newCtrl.text,
+                    );
+                if (mounted) {
+                  ScaffoldMessenger.of(context).showSnackBar(
+                    SnackBar(
+                      content: Text(
+                        result.success
+                            ? '密码已修改'
+                            : result.message ?? '修改失败',
+                      ),
+                    ),
+                  );
+                }
+              },
+              child: const Text('确认修改'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  void _confirmLogout() async {
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('退出登录'),
+        content: const Text('确定要退出登录吗？'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(ctx).pop(false),
+            child: const Text('取消'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.of(ctx).pop(true),
+            child: const Text('退出'),
+          ),
+        ],
+      ),
+    );
+    if (confirmed == true) {
+      await ref.read(authStateProvider.notifier).logout();
+      if (mounted) {
+        context.go('/login');
+      }
+    }
+  }
+}
+
+class _SectionHeader extends StatelessWidget {
+  final String title;
+  const _SectionHeader({required this.title});
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(16, 16, 16, 4),
+      child: Text(
+        title,
+        style: Theme.of(context).textTheme.titleSmall?.copyWith(
+              color: Theme.of(context).colorScheme.primary,
+              fontWeight: FontWeight.bold,
+            ),
+      ),
+    );
+  }
 }
diff --git a/it0_app/lib/features/settings/presentation/providers/settings_providers.dart b/it0_app/lib/features/settings/presentation/providers/settings_providers.dart
index 010edc9..7becd38 100644
--- a/it0_app/lib/features/settings/presentation/providers/settings_providers.dart
+++ b/it0_app/lib/features/settings/presentation/providers/settings_providers.dart
@@ -1,7 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import '../../../../core/network/dio_client.dart';
 import '../../data/datasources/settings_datasource.dart';
+import '../../data/datasources/settings_remote_datasource.dart';
 import '../../data/repositories/settings_repository_impl.dart';
 import '../../domain/entities/app_settings.dart';
 import '../../domain/repositories/settings_repository.dart';
@@ -27,6 +29,44 @@ final settingsRepositoryProvider = Provider<SettingsRepository?>((ref) {
   return SettingsRepositoryImpl(datasource);
 });
 
+final settingsRemoteDatasourceProvider =
+    Provider<SettingsRemoteDatasource>((ref) {
+  final dio = ref.watch(dioClientProvider);
+  return SettingsRemoteDatasource(dio);
+});
+
+// ---------------------------------------------------------------------------
+// Account profile state
+// ---------------------------------------------------------------------------
+
+class AccountProfile {
+  final String displayName;
+  final String email;
+  final bool isLoading;
+  final String? error;
+
+  const AccountProfile({
+    this.displayName = '',
+    this.email = '',
+    this.isLoading = false,
+    this.error,
+  });
+
+  AccountProfile copyWith({
+    String? displayName,
+    String? email,
+    bool? isLoading,
+    String? error,
+  }) {
+    return AccountProfile(
+      displayName: displayName ?? this.displayName,
+      email: email ?? this.email,
+      isLoading: isLoading ?? this.isLoading,
+      error: error,
+    );
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Settings state notifier
 // ---------------------------------------------------------------------------
@@ -89,6 +129,62 @@ class SettingsNotifier extends StateNotifier<AppSettings> {
   }
 }
 
+// ---------------------------------------------------------------------------
+// Account profile notifier
+// ---------------------------------------------------------------------------
+
+class AccountProfileNotifier extends StateNotifier<AccountProfile> {
+  final SettingsRemoteDatasource _remote;
+
+  AccountProfileNotifier(this._remote) : super(const AccountProfile());
+
+  Future<void> loadProfile() async {
+    state = state.copyWith(isLoading: true, error: null);
+    try {
+      final data = await _remote.getAccount();
+      state = state.copyWith(
+        displayName: data['displayName'] as String? ?? '',
+        email: data['email'] as String? ?? '',
+        isLoading: false,
+      );
+    } catch (e) {
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  Future<bool> updateDisplayName(String name) async {
+    state = state.copyWith(isLoading: true, error: null);
+    try {
+      final data = await _remote.updateAccount(name);
+      state = state.copyWith(
+        displayName: data['displayName'] as String? ?? name,
+        isLoading: false,
+      );
+      return true;
+    } catch (e) {
+      state = state.copyWith(isLoading: false, error: e.toString());
+      return false;
+    }
+  }
+
+  Future<({bool success, String? message})> changePassword({
+    required String currentPassword,
+    required String newPassword,
+  }) async {
+    try {
+      final data = await _remote.changePassword(
+        currentPassword: currentPassword,
+        newPassword: newPassword,
+      );
+      final success = data['success'] as bool? ?? false;
+      final message = data['message'] as String?;
+      return (success: success, message: message);
+    } catch (e) {
+      return (success: false, message: e.toString());
+    }
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main providers
 // ---------------------------------------------------------------------------
@@ -99,6 +195,12 @@ final settingsProvider =
   return SettingsNotifier(repository);
 });
 
+final accountProfileProvider =
+    StateNotifierProvider<AccountProfileNotifier, AccountProfile>((ref) {
+  final remote = ref.watch(settingsRemoteDatasourceProvider);
+  return AccountProfileNotifier(remote);
+});
+
 final themeModeProvider = Provider<ThemeMode>((ref) {
   return ref.watch(settingsProvider).themeMode;
 });
diff --git a/it0_app/lib/main.dart b/it0_app/lib/main.dart
index 3edd864..77d4aae 100644
--- a/it0_app/lib/main.dart
+++ b/it0_app/lib/main.dart
@@ -1,15 +1,26 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:hive_flutter/hive_flutter.dart';
 import 'app.dart';
+import 'features/notifications/presentation/providers/notification_providers.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   await Hive.initFlutter();
 
+  // Initialize local notifications
+  final localNotifications = FlutterLocalNotificationsPlugin();
+  const androidInit = AndroidInitializationSettings('@mipmap/ic_launcher');
+  const initSettings = InitializationSettings(android: androidInit);
+  await localNotifications.initialize(initSettings);
+
   runApp(
-    const ProviderScope(
-      child: IT0App(),
+    ProviderScope(
+      overrides: [
+        localNotificationsPluginProvider.overrideWithValue(localNotifications),
+      ],
+      child: const IT0App(),
     ),
   );
 }
diff --git a/it0_app/pubspec.lock b/it0_app/pubspec.lock
index 748765b..d182d48 100644
--- a/it0_app/pubspec.lock
+++ b/it0_app/pubspec.lock
@@ -201,6 +201,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.1"
+  dbus:
+    dependency: transitive
+    description:
+      name: dbus
+      sha256: d0c98dcd4f5169878b6cf8f6e0a52403a9dff371a3e2f019697accbf6f44a270
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.12"
   dio:
     dependency: "direct main"
     description:
@@ -278,6 +286,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.2"
+  flutter_local_notifications:
+    dependency: "direct main"
+    description:
+      name: flutter_local_notifications
+      sha256: ef41ae901e7529e52934feba19ed82827b11baa67336829564aeab3129460610
+      url: "https://pub.dev"
+    source: hosted
+    version: "18.0.1"
+  flutter_local_notifications_linux:
+    dependency: transitive
+    description:
+      name: flutter_local_notifications_linux
+      sha256: "8f685642876742c941b29c32030f6f4f6dacd0e4eaecb3efbb187d6a3812ca01"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.0"
+  flutter_local_notifications_platform_interface:
+    dependency: transitive
+    description:
+      name: flutter_local_notifications_platform_interface
+      sha256: "6c5b83c86bf819cdb177a9247a3722067dd8cc6313827ce7c77a4b238a26fd52"
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.0.0"
   flutter_markdown:
     dependency: "direct main"
     description:
@@ -342,6 +374,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.2"
+  flutter_sound:
+    dependency: "direct main"
+    description:
+      name: flutter_sound
+      sha256: "77f0252a2f08449d621f68b8fd617c3b391e7f862eaa94bb32f53cc2dc3bbe85"
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.30.0"
+  flutter_sound_platform_interface:
+    dependency: transitive
+    description:
+      name: flutter_sound_platform_interface
+      sha256: "5ffc858fd96c6fa277e3bb25eecc100849d75a8792b1f9674d1ba817aea9f861"
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.30.0"
+  flutter_sound_web:
+    dependency: transitive
+    description:
+      name: flutter_sound_web
+      sha256: "3af46f45f44768c01c83ba260855c956d0963673664947926d942aa6fbf6f6fb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.30.0"
   flutter_svg:
     dependency: "direct main"
     description:
@@ -989,6 +1045,22 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  socket_io_client:
+    dependency: "direct main"
+    description:
+      name: socket_io_client
+      sha256: ef6c989e5eee8d04baf18482ec3d7699b91bc41e279794a99d8e3bef897b074a
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.4"
+  socket_io_common:
+    dependency: transitive
+    description:
+      name: socket_io_common
+      sha256: "162fbaecbf4bf9a9372a62a341b3550b51dcef2f02f3e5830a297fd48203d45b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
   source_gen:
     dependency: transitive
     description:
@@ -1053,6 +1125,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.1"
+  synchronized:
+    dependency: transitive
+    description:
+      name: synchronized
+      sha256: c254ade258ec8282947a0acbbc90b9575b4f19673533ee46f2f6e9b3aeefd7c0
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.4.0"
   term_glyph:
     dependency: transitive
     description:
@@ -1069,6 +1149,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.7"
+  timezone:
+    dependency: transitive
+    description:
+      name: timezone
+      sha256: dd14a3b83cfd7cb19e7888f1cbc20f258b8d71b54c06f79ac585f14093a287d1
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.1"
   timing:
     dependency: transitive
     description:
diff --git a/it0_app/pubspec.yaml b/it0_app/pubspec.yaml
index 2e3ccb4..31560ad 100644
--- a/it0_app/pubspec.yaml
+++ b/it0_app/pubspec.yaml
@@ -41,6 +41,11 @@ dependencies:
   record: ^6.0.0
   flutter_tts: ^4.0.0
   sherpa_onnx: ^1.12.25
+  flutter_sound: ^9.16.3
+
+  # Notifications
+  flutter_local_notifications: ^18.0.1
+  socket_io_client: ^3.0.2
 
   # File paths
   path_provider: ^2.1.0
diff --git a/packages/shared/database/src/tenant-context.middleware.ts b/packages/shared/database/src/tenant-context.middleware.ts
index 4aa0a4e..798b1f2 100644
--- a/packages/shared/database/src/tenant-context.middleware.ts
+++ b/packages/shared/database/src/tenant-context.middleware.ts
@@ -4,7 +4,7 @@ import { TenantContextService, TenantInfo } from '@it0/common';
 @Injectable()
 export class TenantContextMiddleware implements NestMiddleware {
   use(req: any, res: any, next: () => void) {
-    const tenantId = req.headers?.['x-tenant-id'] as string;
+    let tenantId = req.headers?.['x-tenant-id'] as string;
 
     // Decode JWT to populate req.user for RolesGuard
     const authHeader = req.headers?.['authorization'] as string;
@@ -20,6 +20,11 @@ export class TenantContextMiddleware implements NestMiddleware {
           tenantId: payload.tenantId,
           roles: payload.roles || [],
         };
+
+        // Fall back to JWT tenantId if header is missing
+        if (!tenantId && payload.tenantId) {
+          tenantId = payload.tenantId;
+        }
       } catch {
         // Ignore decode errors - JWT validation is handled by Kong
       }