feat: 二级页面色彩刷新 + 用药/通知/设备重构 + 后端健康档案/通知管线增强 + 大量测试

## 后端
- 健康档案: 新增手术状态字段 + EF 迁移; HealthArchiveService 新增查询方法
- 健康记录: HealthRecordService 新增批量/统计方法; 契约扩展
- 用药: 新增 MedicationScheduleStatus 枚举; MedicationService 排班逻辑调整
- 通知: EfUserNotificationPipeline 重构; 新增 EfReminderCatchUpService; 通知管线支持更多场景
- 用户: UserService 账号删除逻辑; 新增 local_account_file_cleanup; EfUserRepository 扩展
- AI: medication_agent_handler 微调; prompt_manager 优化; AiConversationService 上下文处理
- Endpoint: doctor/medication/exercise/health/notification/user 等多接口调整
- BackgroundService: health_record_reminder_service 重构, 提醒补漏逻辑
- 测试: 新增 account_deletion/doctor_endpoint/medication_schedule/medication_update/prompt_manager 测试

## 前端
- UI 系统: app_theme 大幅重构; app_colors/app_design_tokens/app_module_visuals 调整; 二级页面色彩刷新
- 主页: home_page 背景渐变 + 消息列表提取 _HomeMessages + 通知检查逻辑; chat_messages_view 全面重构
- 用药: medication_list/edit/checkin 三页重构, 新增 medication_ui_logic 抽取
- 通知: notification_prefs_page 重构, 新增 notification_prefs_logic; notification_center 优化
- 设备: device_management 重构, 新增 device_sync_ui_logic; device_scan 优化
- 趋势图: trend_page 大幅重构
- 登录: login_page 重构
- 个人资料: 新增 profile_edit_page; profile_page 优化
- 运动: 新增 exercise/ 目录 + care_plan_ui_logic
- 其他: remaining_pages/report_pages/health_drawer/admin/doctor 等多页面调整
- 组件: common_widgets/app_empty_state/app_error_state/app_future_view/app_toast/ai_content 优化
- Provider: chat_provider/consultation_provider/data_providers/auth_provider 调整
- AndroidManifest: 移除多余权限
- 测试: 新增 ai_content/care_plan/home_message/login_flow/medication_checkin/medication_ui/notification_prefs/profile_device/secondary_page/swipe_delete 等大量测试

## 文档
- 新增 ui-design-system.md 设计系统文档
- 新增 secondary-page-color-refresh 计划 + specs 目录

health_app/lib/services/admin_service.dart

@@ -14,7 +14,10 @@ class AdminService {
     return res.data;
   }
 
-  Future<Map<String, dynamic>> updateDoctor(String id, Map<String, dynamic> data) async {
+  Future<Map<String, dynamic>> updateDoctor(
+    String id,
+    Map<String, dynamic> data,
+  ) async {
     final res = await _api.put('/api/admin/doctors/$id', data: data);
     return res.data;
   }
@@ -29,7 +32,11 @@ class AdminService {
     return res.data;
   }
 
-  Future<Map<String, dynamic>> getPatients({String? search, int page = 1, int pageSize = 20}) async {
+  Future<Map<String, dynamic>> getPatients({
+    String? search,
+    int page = 1,
+    int pageSize = 20,
+  }) async {
     final query = <String, dynamic>{'page': page, 'pageSize': pageSize};
     if (search != null && search.isNotEmpty) query['search'] = search;
     final res = await _api.get('/api/admin/patients', queryParameters: query);

health_app/lib/services/in_app_notification_service.dart

@@ -78,6 +78,12 @@ class InAppNotificationService {
         .toList();
   }
 
+  Future<int> checkDue() async {
+    final response = await _api.post('/api/notifications/check-due');
+    final data = response.data['data'] as Map? ?? const {};
+    return (data['createdCount'] as num?)?.toInt() ?? 0;
+  }
+
   Future<void> acknowledge(String id) async {
     await _api.post('/api/notifications/$id/acknowledge');
   }