fix(flutter): localize all hardcoded Chinese strings in home_page + restore iAgent brand name

- home_page.dart: use l10n for greeting, default username, agent status, message count
- app_en.arb: fix appTitle back to 'iAgent' (was incorrectly changed to 'My Agent')
- Add defaultUserName and agentInConversation keys to en/zh/zh_TW ARBs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

it0_app/lib/features/home/presentation/pages/home_page.dart

@@ -21,8 +21,9 @@ class HomePage extends ConsumerWidget {
     final chatState = ref.watch(chatProvider);
     final unreadCount = ref.watch(unreadNotificationCountProvider);
 
-    final greeting = _greeting();
+    final l10n = AppLocalizations.of(context);
-    final name = profile.displayName.isNotEmpty ? profile.displayName : '用户';
+    final greeting = _greeting(l10n);
+    final name = profile.displayName.isNotEmpty ? profile.displayName : l10n.defaultUserName;
 
     return Scaffold(
       backgroundColor: AppColors.background,
@@ -40,7 +41,7 @@ class HomePage extends ConsumerWidget {
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
                   Text(
-                    '$greeting，$name',
+                    l10n.homeGreeting(greeting, name),
                     style: const TextStyle(
                       fontSize: 20,
                       fontWeight: FontWeight.bold,
@@ -125,13 +126,13 @@ class HomePage extends ConsumerWidget {
     );
   }
 
-  String _greeting() {
+  String _greeting(AppLocalizations l10n) {
     final hour = DateTime.now().hour;
-    if (hour < 6) return '夜深了';
+    if (hour < 6) return l10n.greetingLateNight;
-    if (hour < 12) return '早上好';
+    if (hour < 12) return l10n.greetingEarlyMorning;
-    if (hour < 14) return '中午好';
+    if (hour < 14) return l10n.greetingNoon;
-    if (hour < 18) return '下午好';
+    if (hour < 18) return l10n.greetingAfternoon;
-    return '晚上好';
+    return l10n.greetingEvening;
   }
 }
 
@@ -147,12 +148,13 @@ class _AgentStatusCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final isActive = chatState.isStreaming;
+    final l10n = AppLocalizations.of(context);
     final statusText = switch (chatState.agentStatus) {
-      AgentStatus.idle => '空闲中',
+      AgentStatus.idle => l10n.agentStatusIdle,
-      AgentStatus.thinking => '正在思考...',
+      AgentStatus.thinking => l10n.agentStatusThinking,
-      AgentStatus.executing => '执行指令中...',
+      AgentStatus.executing => l10n.agentStatusExecuting,
-      AgentStatus.awaitingApproval => '等待审批',
+      AgentStatus.awaitingApproval => l10n.agentStatusAwaitingApproval,
-      AgentStatus.error => '发生错误',
+      AgentStatus.error => l10n.agentStatusError,
     };
     final robotState = switch (chatState.agentStatus) {
       AgentStatus.idle => RobotState.idle,
@@ -225,7 +227,7 @@ class _AgentStatusCard extends StatelessWidget {
                 if (chatState.messages.isNotEmpty) ...[
                   const SizedBox(height: 6),
                   Text(
-                    '对话中 · ${chatState.messages.length} 条消息',
+                    l10n.agentInConversation(chatState.messages.length),
                     style: const TextStyle(
                       fontSize: 12,
                       color: AppColors.textMuted,

it0_app/lib/l10n/app_en.arb

@@ -1,7 +1,7 @@
 {
   "@@locale": "en",
 
-  "appTitle": "My Agent",
+  "appTitle": "iAgent",
   "appSubtitle": "Server Cluster Operations AI Agent",
 
   "navHome": "Home",
@@ -426,5 +426,13 @@
   "errorConnectionClosed": "Connection closed, please retry",
   "errorSocketException": "Network error, check your connection",
   "errorTlsException": "Secure connection failed, check your network",
-  "errorNetworkRequestFailed": "Network request failed, check your connection"
+  "errorNetworkRequestFailed": "Network request failed, check your connection",
+
+  "defaultUserName": "User",
+  "agentInConversation": "In conversation · {count} messages",
+  "@agentInConversation": {
+    "placeholders": {
+      "count": { "type": "int" }
+    }
+  }
 }

it0_app/lib/l10n/app_localizations.dart

@@ -2228,6 +2228,18 @@ abstract class AppLocalizations {
   /// In zh, this message translates to:
   /// **'网络请求失败，请检查网络后重试'**
   String get errorNetworkRequestFailed;
+
+  /// No description provided for @defaultUserName.
+  ///
+  /// In zh, this message translates to:
+  /// **'用户'**
+  String get defaultUserName;
+
+  /// No description provided for @agentInConversation.
+  ///
+  /// In zh, this message translates to:
+  /// **'对话中 · {count} 条消息'**
+  String agentInConversation(int count);
 }
 
 class _AppLocalizationsDelegate

it0_app/lib/l10n/app_localizations_en.dart

@@ -9,7 +9,7 @@ class AppLocalizationsEn extends AppLocalizations {
   AppLocalizationsEn([String locale = 'en']) : super(locale);
 
   @override
-  String get appTitle => 'My Agent';
+  String get appTitle => 'iAgent';
 
   @override
   String get appSubtitle => 'Server Cluster Operations AI Agent';
@@ -1133,4 +1133,12 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get errorNetworkRequestFailed =>
       'Network request failed, check your connection';
+
+  @override
+  String get defaultUserName => 'User';
+
+  @override
+  String agentInConversation(int count) {
+    return 'In conversation · $count messages';
+  }
 }

it0_app/lib/l10n/app_localizations_zh.dart

@@ -1100,6 +1100,14 @@ class AppLocalizationsZh extends AppLocalizations {
 
   @override
   String get errorNetworkRequestFailed => '网络请求失败，请检查网络后重试';
+
+  @override
+  String get defaultUserName => '用户';
+
+  @override
+  String agentInConversation(int count) {
+    return '对话中 · $count 条消息';
+  }
 }
 
 /// The translations for Chinese, as used in Taiwan (`zh_TW`).
@@ -1518,4 +1526,12 @@ class AppLocalizationsZhTw extends AppLocalizationsZh {
 
   @override
   String get profileViewMessagesLabel => '查看訊息';
+
+  @override
+  String get defaultUserName => '用戶';
+
+  @override
+  String agentInConversation(int count) {
+    return '對話中 · $count 則訊息';
+  }
 }

it0_app/lib/l10n/app_zh.arb

@@ -426,5 +426,13 @@
   "errorConnectionClosed": "连接已关闭，请稍后重试",
   "errorSocketException": "网络连接异常，请检查网络设置",
   "errorTlsException": "安全连接失败，请检查网络环境",
-  "errorNetworkRequestFailed": "网络请求失败，请检查网络后重试"
+  "errorNetworkRequestFailed": "网络请求失败，请检查网络后重试",
+
+  "defaultUserName": "用户",
+  "agentInConversation": "对话中 · {count} 条消息",
+  "@agentInConversation": {
+    "placeholders": {
+      "count": { "type": "int" }
+    }
+  }
 }

it0_app/lib/l10n/app_zh_TW.arb

@@ -162,5 +162,13 @@
   "profileReferralLabel": "邀請有禮",
   "profileReferralHint": "推薦賺積分",
   "profileInSiteMessagesLabel": "站內訊息",
-  "profileViewMessagesLabel": "查看訊息"
+  "profileViewMessagesLabel": "查看訊息",
+
+  "defaultUserName": "用戶",
+  "agentInConversation": "對話中 · {count} 則訊息",
+  "@agentInConversation": {
+    "placeholders": {
+      "count": { "type": "int" }
+    }
+  }
 }