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/providers/data_providers.dart

@@ -43,9 +43,7 @@ final inAppNotificationServiceProvider = Provider<InAppNotificationService>((
   return InAppNotificationService(ref.watch(apiClientProvider));
 });
 
-final notificationUnreadCountProvider = FutureProvider.autoDispose<int>((
-  ref,
-) async {
+final notificationUnreadCountProvider = FutureProvider<int>((ref) async {
   final history = await ref
       .watch(inAppNotificationServiceProvider)
       .getHistory();
@@ -53,14 +51,11 @@ final notificationUnreadCountProvider = FutureProvider.autoDispose<int>((
 });
 
 /// 最新健康数据 Provider
-final latestHealthProvider = FutureProvider.autoDispose<Map<String, dynamic>>((
-  ref,
-) async {
+final latestHealthProvider = FutureProvider<Map<String, dynamic>>((ref) async {
   final service = ref.watch(healthServiceProvider);
   return service.getLatest();
 });
 
-
 /// 用药列表 Provider
 final medicationListProvider =
     FutureProvider.autoDispose<List<Map<String, dynamic>>>((ref) async {
@@ -68,27 +63,50 @@ final medicationListProvider =
       return service.getList();
     });
 
-final medicationReminderProvider =
-    FutureProvider.autoDispose<List<Map<String, dynamic>>>((ref) async {
-      final service = ref.watch(medicationServiceProvider);
-      return service.getReminders();
-    });
-
-/// 医生列表 Provider
-final doctorListProvider = FutureProvider<List<Map<String, dynamic>>>((
+final medicationReminderProvider = FutureProvider<List<Map<String, dynamic>>>((
   ref,
 ) async {
-  final service = ref.watch(consultationServiceProvider);
-  return service.getDoctors().timeout(const Duration(seconds: 8));
+  final service = ref.watch(medicationServiceProvider);
+  return service.getReminders();
 });
 
-/// 当前运动计划 Provider
-final currentExercisePlanProvider =
-    FutureProvider.autoDispose<Map<String, dynamic>?>((ref) async {
-      final service = ref.watch(exerciseServiceProvider);
-      return service.getCurrentPlan().timeout(const Duration(seconds: 8));
+/// 医生列表 Provider
+final doctorListProvider =
+    FutureProvider.autoDispose<List<Map<String, dynamic>>>((ref) async {
+      final service = ref.watch(consultationServiceProvider);
+      return service.getDoctors().timeout(const Duration(seconds: 8));
     });
 
+/// 当前运动计划 Provider
+final currentExercisePlanProvider = FutureProvider<Map<String, dynamic>?>((
+  ref,
+) async {
+  final service = ref.watch(exerciseServiceProvider);
+  return service.getCurrentPlan().timeout(const Duration(seconds: 8));
+});
+
+typedef TodayHealthSnapshot = ({
+  Map<String, dynamic> health,
+  List<Map<String, dynamic>> reminders,
+  Map<String, dynamic>? exercisePlan,
+});
+
+/// 首页今日健康一次性快照。依赖项即使先后返回，也只在全部完成后整体更新。
+final todayHealthSnapshotProvider = FutureProvider<TodayHealthSnapshot>((
+  ref,
+) async {
+  final values = await Future.wait<dynamic>([
+    ref.watch(latestHealthProvider.future),
+    ref.watch(medicationReminderProvider.future),
+    ref.watch(currentExercisePlanProvider.future),
+  ]);
+  return (
+    health: values[0] as Map<String, dynamic>,
+    reminders: values[1] as List<Map<String, dynamic>>,
+    exercisePlan: values[2] as Map<String, dynamic>?,
+  );
+});
+
 /// 拍照/相册直接触发（无需跳转页面）
 final cameraActionProvider = NotifierProvider<CameraActionNotifier, String?>(
   CameraActionNotifier.new,