fix(mobile-app): 退出登录时停止遥测上传

- TelemetryService 添加 pauseForLogout() 方法
- 退出登录时先停止定期上传再清空队列
- 避免退出后继续上传导致等待

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

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

frontend/mobile-app/lib/core/services/multi_account_service.dart

@@ -405,16 +405,13 @@ class MultiAccountService {
     }
     debugPrint('$_tag logoutCurrentAccount() - 已清除 ${_accountLocalKeys.length} 个 LocalStorage 缓存');
 
-    // ===== 3. 清除遥测事件队列（用户相关数据） =====
-    await _telemetryStorage.clearUserData();
-
-    // ===== 4. 清除遥测服务的用户ID =====
+    // ===== 3. 暂停遥测服务（停止上传、清空队列、清除用户ID） =====
     if (TelemetryService().isInitialized) {
-      TelemetryService().clearUserId();
-      debugPrint('$_tag logoutCurrentAccount() - 清除 TelemetryService userId');
+      await TelemetryService().pauseForLogout();
+      debugPrint('$_tag logoutCurrentAccount() - 已暂停 TelemetryService');
     }
 
-    // ===== 5. 清除 Sentry 用户信息 =====
+    // ===== 4. 清除 Sentry 用户信息 =====
     if (SentryService().isInitialized) {
       SentryService().clearUser();
       debugPrint('$_tag logoutCurrentAccount() - 清除 SentryService userId');

frontend/mobile-app/lib/core/telemetry/telemetry_service.dart

@@ -291,6 +291,23 @@ class TelemetryService {
     debugPrint('📊 [Telemetry] User ID cleared');
   }
 
+  /// 暂停遥测上传（退出登录时调用）
+  /// 停止定期上传任务，清空事件队列
+  Future<void> pauseForLogout() async {
+    _uploader.stopPeriodicUpload();
+    await _storage.clearEventQueue();
+    _userId = null;
+    debugPrint('📊 [Telemetry] Paused for logout');
+  }
+
+  /// 恢复遥测上传（登录后调用）
+  void resumeAfterLogin() {
+    if (TelemetryConfig().globalEnabled) {
+      _uploader.startPeriodicUpload();
+      debugPrint('📊 [Telemetry] Resumed after login');
+    }
+  }
+
   /// 设置用户是否同意数据收集
   Future<void> setUserOptIn(bool optIn) async {
     await TelemetryConfig().setUserOptIn(optIn);