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/pages/settings/notification_prefs_logic.dart

@@ -0,0 +1,107 @@
+enum HealthReminderMetric { bloodPressure, heartRate, glucose, spo2, weight }
+
+extension HealthReminderMetricX on HealthReminderMetric {
+  String get label => switch (this) {
+    HealthReminderMetric.bloodPressure => '血压',
+    HealthReminderMetric.heartRate => '心率',
+    HealthReminderMetric.glucose => '血糖',
+    HealthReminderMetric.spo2 => '血氧',
+    HealthReminderMetric.weight => '体重',
+  };
+
+  String get backendField => switch (this) {
+    HealthReminderMetric.bloodPressure => 'healthRecordReminderBloodPressure',
+    HealthReminderMetric.heartRate => 'healthRecordReminderHeartRate',
+    HealthReminderMetric.glucose => 'healthRecordReminderGlucose',
+    HealthReminderMetric.spo2 => 'healthRecordReminderSpO2',
+    HealthReminderMetric.weight => 'healthRecordReminderWeight',
+  };
+}
+
+class NotificationPrefs {
+  final bool pushEnabled;
+  final bool medicationReminder;
+  final bool followUpReminder;
+  final bool doctorReply;
+  final bool abnormalAlert;
+  final bool dndEnabled;
+  final int dndStartMinutes;
+  final int dndEndMinutes;
+  final bool healthRecordReminder;
+  final Set<HealthReminderMetric> enabledHealthMetrics;
+
+  const NotificationPrefs({
+    required this.pushEnabled,
+    required this.medicationReminder,
+    required this.followUpReminder,
+    required this.doctorReply,
+    required this.abnormalAlert,
+    required this.dndEnabled,
+    required this.dndStartMinutes,
+    required this.dndEndMinutes,
+    required this.healthRecordReminder,
+    required this.enabledHealthMetrics,
+  });
+
+  factory NotificationPrefs.fromJson(Map<dynamic, dynamic> json) {
+    final metrics = <HealthReminderMetric>{};
+    for (final metric in HealthReminderMetric.values) {
+      if ((json[metric.backendField] as bool?) ?? true) metrics.add(metric);
+    }
+    return NotificationPrefs(
+      pushEnabled: (json['pushEnabled'] as bool?) ?? true,
+      medicationReminder: (json['medicationReminder'] as bool?) ?? true,
+      followUpReminder: (json['followUpReminder'] as bool?) ?? true,
+      doctorReply: (json['doctorReply'] as bool?) ?? false,
+      abnormalAlert: (json['abnormalAlert'] as bool?) ?? true,
+      dndEnabled: (json['dndEnabled'] as bool?) ?? false,
+      dndStartMinutes: (json['dndStartMinutes'] as num?)?.toInt() ?? 22 * 60,
+      dndEndMinutes: (json['dndEndMinutes'] as num?)?.toInt() ?? 8 * 60,
+      healthRecordReminder: (json['healthRecordReminder'] as bool?) ?? true,
+      enabledHealthMetrics: Set.unmodifiable(metrics),
+    );
+  }
+}
+
+class NotificationPrefsViewState {
+  final NotificationPrefs? prefs;
+  final bool loading;
+  final String? loadError;
+  final Set<String> savingKeys;
+
+  const NotificationPrefsViewState({
+    this.prefs,
+    this.loading = false,
+    this.loadError,
+    this.savingKeys = const {},
+  });
+
+  NotificationPrefsViewState copyWith({
+    NotificationPrefs? prefs,
+    bool? loading,
+    String? loadError,
+    bool clearLoadError = false,
+    Set<String>? savingKeys,
+  }) => NotificationPrefsViewState(
+    prefs: prefs ?? this.prefs,
+    loading: loading ?? this.loading,
+    loadError: clearLoadError ? null : loadError ?? this.loadError,
+    savingKeys: savingKeys ?? this.savingKeys,
+  );
+}
+
+String healthMetricSummary(Set<HealthReminderMetric> metrics) {
+  if (metrics.isEmpty) return '至少选择一项';
+  if (metrics.length == HealthReminderMetric.values.length) return '全部指标';
+  return HealthReminderMetric.values
+      .where(metrics.contains)
+      .map((metric) => metric.label)
+      .join('、');
+}
+
+Map<String, bool> healthMetricUpdatePayload(
+  Set<HealthReminderMetric> metrics,
+) => {
+  for (final metric in HealthReminderMetric.values)
+    metric.backendField: metrics.contains(metric),
+};