feat: 后端架构重构 — Endpoint→Service→Repository分层 + AI确认机制 + 异步任务持久化

- 核心业务拆分为 Endpoint → Application Service → Repository 三层
- AI写入操作必须用户确认后才写库(确认卡片机制)
- 报告/饮食/用药分析改为持久化任务队列(原子领取/重试/重启恢复)
- 运动计划修复: 连续真实日期替代周模板
- 用药提醒去重 + 通知Outbox预留
- 认证收拢到AuthService, 管理员收拢到AdminService
- AI会话加用户归属校验防串号
- 提示词调整为患者视角
- 开发假数据已关闭
- 21/21测试通过, 0警告0错误

health_app/lib/pages/settings/notification_prefs_page.dart

@@ -171,10 +171,11 @@ class NotificationPrefsPage extends ConsumerWidget {
                             context: context,
                             initialTime: const TimeOfDay(hour: 22, minute: 0),
                           );
-                          if (picked != null && context.mounted)
+                          if (picked != null && context.mounted) {
                             ref
                                 .read(notificationPrefsProvider.notifier)
                                 .setDndStart(picked);
+                          }
                         },
                       ),
                     ),
@@ -197,10 +198,11 @@ class NotificationPrefsPage extends ConsumerWidget {
                             context: context,
                             initialTime: const TimeOfDay(hour: 8, minute: 0),
                           );
-                          if (picked != null && context.mounted)
+                          if (picked != null && context.mounted) {
                             ref
                                 .read(notificationPrefsProvider.notifier)
                                 .setDndEnd(picked);
+                          }
                         },
                       ),
                     ),

health_app/lib/pages/settings/settings_pages.dart

@@ -5,7 +5,6 @@ import '../../core/app_colors.dart';
 import '../../core/app_theme.dart';
 import '../../core/navigation_provider.dart';
 import '../../providers/auth_provider.dart';
-import '../../providers/data_providers.dart' show apiClientProvider;
 
 class SettingsPage extends ConsumerWidget {
   const SettingsPage({super.key});