chore(mobile-app): 补全多账号切换流程的关键日志，便于验证与排查

切换流程中的每一步现在都有清晰的日志输出，方便通过 adb logcat
或 flutter logs 验证切换行为是否符合预期。

account_switch_page.dart - 三条路径全部覆盖：

_switchToAccount（切换账号）：
  [1/6] 保存当前账号数据
  [2/6] 调用 switchToAccount()
  [3/6] onBeforeRestore - 停止 walletStatus/pendingAction 轮询、暂停遥测
  [4/6] invalidate authProvider / walletStatusProvider / notificationBadgeProvider
  [5/6] 恢复遥测上传
  [6/6] 导航到 ranking 页面

_addNewAccount（添加新账号）：
  [1/5] 保存当前账号数据
  [2/5] 停止定时器
  [3/5] 调用 logoutCurrentAccount()
  [4/5] invalidate 三个 Provider
  [5/5] 导航到 guide 页面

_deleteAccount（删除账号）：
  删除前打印目标账号，删除后打印剩余账号数

profile_page.dart - _performLogout（退出登录）：
  [1/4] 停止 walletStatus/pendingAction 轮询
  [2/4] 调用 logoutCurrentAccount()
  [3/4] invalidate 三个 Provider
  [4/4] 导航到 guide 页面

每条关键操作完成后打印 ✓ 确认符号，便于逐步验证。
每条路径用 ========== 分隔符标识开始/完成，日志易于 grep 过滤。

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

frontend/mobile-app/lib/features/account/presentation/pages/account_switch_page.dart

@@ -32,7 +32,10 @@ class _AccountSwitchPageState extends ConsumerState<AccountSwitchPage> {
     _loadAccounts();
   }
 
+  static const String _tag = '[AccountSwitchPage]';
+
   Future<void> _loadAccounts() async {
+    debugPrint('$_tag _loadAccounts() - 开始加载账号列表');
     setState(() => _isLoading = true);
 
     final multiAccountService = ref.read(multiAccountServiceProvider);
@@ -43,6 +46,8 @@ class _AccountSwitchPageState extends ConsumerState<AccountSwitchPage> {
     final accounts = await multiAccountService.getAccountList();
     final currentId = await multiAccountService.getCurrentAccountId();
 
+    debugPrint('$_tag _loadAccounts() - 加载完成: ${accounts.length} 个账号, 当前=$currentId');
+
     if (mounted) {
       setState(() {
         _accounts = accounts;
@@ -54,55 +59,74 @@ class _AccountSwitchPageState extends ConsumerState<AccountSwitchPage> {
 
   Future<void> _switchToAccount(AccountSummary account) async {
     if (account.userSerialNum == _currentAccountId) {
-      // 已是当前账号，直接返回
+      debugPrint('$_tag _switchToAccount() - 已是当前账号 ${account.userSerialNum}，直接返回');
       context.pop();
       return;
     }
 
+    debugPrint('$_tag ========== 开始切换账号 ==========');
+    debugPrint('$_tag 当前账号: $_currentAccountId');
+    debugPrint('$_tag 目标账号: ${account.userSerialNum} (${account.username})');
     setState(() => _isSwitching = true);
 
     try {
       final multiAccountService = ref.read(multiAccountServiceProvider);
 
       // 保存当前账号数据
+      debugPrint('$_tag [1/6] 保存当前账号数据...');
       await multiAccountService.saveCurrentAccountData();
 
       // 切换到新账号
       // onBeforeRestore: storage 已清空、新数据尚未恢复 → 只停定时器
       // Provider invalidate 必须在 switchToAccount 返回后做（此时 storage 已恢复新账号数据）
+      debugPrint('$_tag [2/6] 调用 switchToAccount()...');
       final success = await multiAccountService.switchToAccount(
         account.userSerialNum,
         onBeforeRestore: () async {
           // ===== 1. 停止所有用户相关的定时任务 =====
+          debugPrint('$_tag [3/6] onBeforeRestore - 停止定时器...');
           ref.read(walletStatusProvider.notifier).stopPolling();
+          debugPrint('$_tag   ✓ walletStatusProvider 轮询已停止');
           ref.read(pendingActionPollingServiceProvider).stop();
+          debugPrint('$_tag   ✓ pendingActionPollingService 已停止');
           // 遥测：清空旧账号事件队列、停止上传
           if (TelemetryService().isInitialized) {
             await TelemetryService().pauseForLogout();
+            debugPrint('$_tag   ✓ TelemetryService 已暂停');
           }
+          debugPrint('$_tag [3/6] onBeforeRestore - 定时器全部停止');
         },
       );
 
       if (success && mounted) {
         // ===== 2. invalidate 所有账号相关 Provider（此时 storage 已是新账号数据）=====
+        debugPrint('$_tag [4/6] switchToAccount 成功，invalidate Provider...');
         ref.invalidate(authProvider);
+        debugPrint('$_tag   ✓ authProvider invalidated');
         ref.invalidate(walletStatusProvider);
+        debugPrint('$_tag   ✓ walletStatusProvider invalidated');
         ref.invalidate(notificationBadgeProvider);
+        debugPrint('$_tag   ✓ notificationBadgeProvider invalidated');
 
         // ===== 3. 恢复遥测上传（新账号上下文）=====
+        debugPrint('$_tag [5/6] 恢复遥测上传...');
         if (TelemetryService().isInitialized) {
           TelemetryService().resumeAfterLogin();
+          debugPrint('$_tag   ✓ TelemetryService 已恢复');
         }
 
         // 切换成功，跳转到主页刷新状态
+        debugPrint('$_tag [6/6] 导航到 ranking 页面');
+        debugPrint('$_tag ========== 切换账号完成 ==========');
         context.go(RoutePaths.ranking);
       } else if (mounted) {
+        debugPrint('$_tag switchToAccount 返回 false，切换失败');
         ScaffoldMessenger.of(context).showSnackBar(
           const SnackBar(content: Text('切换账号失败')),
         );
       }
     } catch (e) {
-      debugPrint('[AccountSwitchPage] 切换账号失败: $e');
+      debugPrint('$_tag 切换账号异常: $e');
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(content: Text('切换账号失败: $e')),
@@ -118,32 +142,45 @@ class _AccountSwitchPageState extends ConsumerState<AccountSwitchPage> {
   Future<void> _addNewAccount() async {
     if (_isAddingAccount) return;
 
+    debugPrint('$_tag ========== 开始添加新账号 ==========');
+    debugPrint('$_tag 当前账号: $_currentAccountId');
     setState(() => _isAddingAccount = true);
 
     try {
       final multiAccountService = ref.read(multiAccountServiceProvider);
 
       // 保存当前账号数据
+      debugPrint('$_tag [1/5] 保存当前账号数据...');
       await multiAccountService.saveCurrentAccountData();
 
       // ===== 1. 停止所有用户相关的定时任务 =====
+      debugPrint('$_tag [2/5] 停止定时器...');
       ref.read(walletStatusProvider.notifier).stopPolling();
+      debugPrint('$_tag   ✓ walletStatusProvider 轮询已停止');
       ref.read(pendingActionPollingServiceProvider).stop();
+      debugPrint('$_tag   ✓ pendingActionPollingService 已停止');
 
       // 退出当前账号但保留数据
+      debugPrint('$_tag [3/5] 调用 logoutCurrentAccount()...');
       await multiAccountService.logoutCurrentAccount();
 
       // ===== 2. invalidate 所有账号相关 Provider =====
+      debugPrint('$_tag [4/5] invalidate Provider...');
       ref.invalidate(authProvider);
+      debugPrint('$_tag   ✓ authProvider invalidated');
       ref.invalidate(walletStatusProvider);
+      debugPrint('$_tag   ✓ walletStatusProvider invalidated');
       ref.invalidate(notificationBadgeProvider);
+      debugPrint('$_tag   ✓ notificationBadgeProvider invalidated');
 
       // 跳转到向导页创建新账号
+      debugPrint('$_tag [5/5] 导航到 guide 页面');
+      debugPrint('$_tag ========== 添加新账号准备完成 ==========');
       if (mounted) {
         context.go(RoutePaths.guide);
       }
     } catch (e) {
-      debugPrint('[AccountSwitchPage] 添加新账号失败: $e');
+      debugPrint('$_tag 添加新账号异常: $e');
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(content: Text('添加新账号失败: $e')),
@@ -181,19 +218,26 @@ class _AccountSwitchPageState extends ConsumerState<AccountSwitchPage> {
 
     if (confirmed != true) return;
 
+    debugPrint('$_tag ========== 开始删除账号 ==========');
+    debugPrint('$_tag 删除目标: ${account.userSerialNum} (${account.username})');
+
     try {
       final multiAccountService = ref.read(multiAccountServiceProvider);
       await multiAccountService.deleteAccount(account.userSerialNum);
+      debugPrint('$_tag 账号已从存储中删除');
 
       // 重新加载账号列表
       await _loadAccounts();
+      debugPrint('$_tag 账号列表已刷新，剩余 ${_accounts.length} 个账号');
 
       // 如果没有账号了，跳转到向导页
       if (_accounts.isEmpty && mounted) {
+        debugPrint('$_tag 无剩余账号，导航到 guide 页面');
         context.go(RoutePaths.guide);
       }
+      debugPrint('$_tag ========== 删除账号完成 ==========');
     } catch (e) {
-      debugPrint('[AccountSwitchPage] 删除账号失败: $e');
+      debugPrint('$_tag 删除账号异常: $e');
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(content: Text('删除账号失败: $e')),

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

@@ -4793,26 +4793,37 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
 
   /// 执行退出登录
   Future<void> _performLogout() async {
+    debugPrint('[ProfilePage] ========== 开始退出登录 ==========');
     try {
       // ===== 1. 停止所有用户相关的定时任务 =====
+      debugPrint('[ProfilePage] [1/4] 停止定时器...');
       ref.read(walletStatusProvider.notifier).stopPolling();
+      debugPrint('[ProfilePage]   ✓ walletStatusProvider 轮询已停止');
       ref.read(pendingActionPollingServiceProvider).stop();
+      debugPrint('[ProfilePage]   ✓ pendingActionPollingService 已停止');
 
       final multiAccountService = ref.read(multiAccountServiceProvider);
-      // 退出当前账号（保留账号数据）
+      // 退出当前账号（保留账号数据，清除 storage + 暂停遥测）
+      debugPrint('[ProfilePage] [2/4] 调用 logoutCurrentAccount()...');
       await multiAccountService.logoutCurrentAccount();
 
       // ===== 2. invalidate 所有账号相关 Provider =====
+      debugPrint('[ProfilePage] [3/4] invalidate Provider...');
       ref.invalidate(authProvider);
+      debugPrint('[ProfilePage]   ✓ authProvider invalidated');
       ref.invalidate(walletStatusProvider);
+      debugPrint('[ProfilePage]   ✓ walletStatusProvider invalidated');
       ref.invalidate(notificationBadgeProvider);
+      debugPrint('[ProfilePage]   ✓ notificationBadgeProvider invalidated');
 
       // 导航到向导页
+      debugPrint('[ProfilePage] [4/4] 导航到 guide 页面');
+      debugPrint('[ProfilePage] ========== 退出登录完成 ==========');
       if (mounted) {
         context.go(RoutePaths.guide);
       }
     } catch (e) {
-      debugPrint('[ProfilePage] 退出登录失败: $e');
+      debugPrint('[ProfilePage] 退出登录异常: $e');
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(content: Text('退出登录失败: $e')),