feat(profile): 添加退出登录和切换账号功能

- 在版本信息栏添加构建模式显示(Debug/Release/Profile)
- 在版本信息栏下方添加切换账号按钮(暂显示即将上线提示)
- 在版本信息栏下方添加退出登录按钮(带确认对话框)
- 退出登录后清除本地数据并跳转到向导页

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mobile-app/lib/features/profile/presentation/pages/profile_page.dart

@@ -1,5 +1,6 @@
 import 'dart:io';
 import 'dart:async';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
@@ -802,66 +803,71 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
     return Container(
       height: 48,
       padding: const EdgeInsets.only(top: 8),
-      child: Row(
+      child: Stack(
-        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+        alignment: Alignment.center,
         children: [
-          // 页面标题
+          // 页面标题（居中显示）
-          const Text(
+          const Center(
-            '我的',
+            child: Text(
-            style: TextStyle(
+              '我的',
-              fontSize: 20,
+              style: TextStyle(
-              fontFamily: 'Inter',
+                fontSize: 20,
-              fontWeight: FontWeight.w700,
+                fontFamily: 'Inter',
-              color: Color(0xFF5D4037),
+                fontWeight: FontWeight.w700,
+                color: Color(0xFF5D4037),
+              ),
             ),
           ),
-          // 通知图标（带未读角标）
+          // 通知图标（右侧，带未读角标）
-          GestureDetector(
+          Positioned(
-            onTap: _goToNotifications,
+            right: 0,
-            child: Container(
+            child: GestureDetector(
-              width: 40,
+              onTap: _goToNotifications,
-              height: 40,
+              child: Container(
-              alignment: Alignment.center,
+                width: 40,
-              child: Stack(
+                height: 40,
-                clipBehavior: Clip.none,
+                alignment: Alignment.center,
-                children: [
+                child: Stack(
-                  const Icon(
+                  clipBehavior: Clip.none,
-                    Icons.notifications_outlined,
+                  children: [
-                    size: 26,
+                    const Icon(
-                    color: Color(0xFF5D4037),
+                      Icons.notifications_outlined,
-                  ),
+                      size: 26,
-                  // 未读角标
+                      color: Color(0xFF5D4037),
-                  if (_unreadNotificationCount > 0)
+                    ),
-                    Positioned(
+                    // 未读角标
-                      top: -4,
+                    if (_unreadNotificationCount > 0)
-                      right: -4,
+                      Positioned(
-                      child: Container(
+                        top: -4,
-                        padding: const EdgeInsets.symmetric(
+                        right: -4,
-                          horizontal: 5,
+                        child: Container(
-                          vertical: 2,
+                          padding: const EdgeInsets.symmetric(
-                        ),
+                            horizontal: 5,
-                        decoration: BoxDecoration(
+                            vertical: 2,
-                          color: const Color(0xFFD4AF37),
+                          ),
-                          borderRadius: BorderRadius.circular(10),
+                          decoration: BoxDecoration(
-                        ),
+                            color: const Color(0xFFD4AF37),
-                        constraints: const BoxConstraints(
+                            borderRadius: BorderRadius.circular(10),
-                          minWidth: 18,
+                          ),
-                          minHeight: 18,
+                          constraints: const BoxConstraints(
-                        ),
+                            minWidth: 18,
-                        child: Text(
+                            minHeight: 18,
-                          _unreadNotificationCount > 99
+                          ),
-                              ? '99+'
+                          child: Text(
-                              : _unreadNotificationCount.toString(),
+                            _unreadNotificationCount > 99
-                          style: const TextStyle(
+                                ? '99+'
-                            fontSize: 10,
+                                : _unreadNotificationCount.toString(),
-                            fontWeight: FontWeight.w600,
+                            style: const TextStyle(
-                            color: Colors.white,
+                              fontSize: 10,
+                              fontWeight: FontWeight.w600,
+                              color: Colors.white,
+                            ),
+                            textAlign: TextAlign.center,
                           ),
-                          textAlign: TextAlign.center,
                         ),
                       ),
-                    ),
+                  ],
-                ],
+                ),
               ),
             ),
           ),
@@ -1309,6 +1315,9 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
           const SizedBox(height: 16),
           // 应用版本信息
           _buildAppVersionInfo(),
+          const SizedBox(height: 16),
+          // 账号操作按钮
+          _buildAccountActionButtons(),
         ],
       ),
     );
@@ -2711,6 +2720,8 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
           const SizedBox(height: 8),
           _buildVersionInfoRow('构建号', _buildNumber),
           const SizedBox(height: 8),
+          _buildVersionInfoRow('构建模式', kReleaseMode ? 'Release' : (kDebugMode ? 'Debug' : 'Profile')),
+          const SizedBox(height: 8),
           _buildVersionInfoRow('包名', _packageName),
           const Divider(
             height: 24,
@@ -2771,4 +2782,152 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
       ],
     );
   }
+
+  /// 构建账号操作按钮（切换账号、退出登录）
+  Widget _buildAccountActionButtons() {
+    return Column(
+      children: [
+        // 切换账号按钮
+        GestureDetector(
+          onTap: _onSwitchAccount,
+          child: Container(
+            width: double.infinity,
+            height: 48,
+            decoration: BoxDecoration(
+              color: const Color(0xFFFFF5E6),
+              borderRadius: BorderRadius.circular(8),
+              border: Border.all(
+                color: const Color(0x33D4AF37),
+                width: 1,
+              ),
+            ),
+            child: const Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                Icon(
+                  Icons.swap_horiz,
+                  size: 20,
+                  color: Color(0xFF8B5A2B),
+                ),
+                SizedBox(width: 8),
+                Text(
+                  '切换账号',
+                  style: TextStyle(
+                    fontSize: 15,
+                    fontFamily: 'Inter',
+                    fontWeight: FontWeight.w500,
+                    height: 1.5,
+                    color: Color(0xFF5D4037),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+        const SizedBox(height: 12),
+        // 退出登录按钮
+        GestureDetector(
+          onTap: _onLogout,
+          child: Container(
+            width: double.infinity,
+            height: 48,
+            decoration: BoxDecoration(
+              color: const Color(0xFFFFF5E6),
+              borderRadius: BorderRadius.circular(8),
+              border: Border.all(
+                color: const Color(0x33E57373),
+                width: 1,
+              ),
+            ),
+            child: const Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                Icon(
+                  Icons.logout,
+                  size: 20,
+                  color: Color(0xFFE57373),
+                ),
+                SizedBox(width: 8),
+                Text(
+                  '退出登录',
+                  style: TextStyle(
+                    fontSize: 15,
+                    fontFamily: 'Inter',
+                    fontWeight: FontWeight.w500,
+                    height: 1.5,
+                    color: Color(0xFFE57373),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+        const SizedBox(height: 32), // 底部留白
+      ],
+    );
+  }
+
+  /// 切换账号
+  void _onSwitchAccount() {
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('切换账号'),
+        content: const Text('多账号管理功能即将上线，敬请期待。'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: const Text('确定'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  /// 退出登录
+  void _onLogout() {
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('退出登录'),
+        content: const Text('确定要退出当前账号吗？\n\n退出后需要重新导入助记词才能恢复账号。'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: const Text('取消'),
+          ),
+          TextButton(
+            onPressed: () {
+              Navigator.of(context).pop();
+              _performLogout();
+            },
+            style: TextButton.styleFrom(
+              foregroundColor: const Color(0xFFE57373),
+            ),
+            child: const Text('退出'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  /// 执行退出登录
+  Future<void> _performLogout() async {
+    try {
+      final accountService = ref.read(accountServiceProvider);
+      // 清除所有本地数据
+      await accountService.logout();
+      // 导航到向导页
+      if (mounted) {
+        context.go(RoutePaths.guide);
+      }
+    } catch (e) {
+      debugPrint('[ProfilePage] 退出登录失败: $e');
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text('退出登录失败: $e')),
+        );
+      }
+    }
+  }
 }