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/test/notification_prefs_logic_test.dart

@@ -0,0 +1,67 @@
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:health_app/pages/settings/notification_prefs_logic.dart';
+
+void main() {
+  test('notification preferences parse the complete backend payload', () {
+    final prefs = NotificationPrefs.fromJson({
+      'pushEnabled': false,
+      'medicationReminder': false,
+      'followUpReminder': true,
+      'doctorReply': true,
+      'abnormalAlert': false,
+      'dndEnabled': true,
+      'dndStartMinutes': 1200,
+      'dndEndMinutes': 420,
+      'healthRecordReminder': true,
+      'healthRecordReminderBloodPressure': true,
+      'healthRecordReminderHeartRate': false,
+      'healthRecordReminderGlucose': true,
+      'healthRecordReminderSpO2': false,
+      'healthRecordReminderWeight': false,
+    });
+
+    expect(prefs.pushEnabled, false);
+    expect(prefs.doctorReply, true);
+    expect(prefs.dndStartMinutes, 1200);
+    expect(prefs.enabledHealthMetrics, {
+      HealthReminderMetric.bloodPressure,
+      HealthReminderMetric.glucose,
+    });
+  });
+
+  test('metric summary remains compact and readable', () {
+    expect(
+      healthMetricSummary({
+        HealthReminderMetric.bloodPressure,
+        HealthReminderMetric.heartRate,
+      }),
+      '血压、心率',
+    );
+    expect(healthMetricSummary(HealthReminderMetric.values.toSet()), '全部指标');
+    expect(healthMetricSummary({}), '至少选择一项');
+  });
+
+  test('metric payload sends all five fields in one request', () {
+    final payload = healthMetricUpdatePayload({
+      HealthReminderMetric.bloodPressure,
+      HealthReminderMetric.spo2,
+    });
+
+    expect(payload.length, 5);
+    expect(payload['healthRecordReminderBloodPressure'], true);
+    expect(payload['healthRecordReminderHeartRate'], false);
+    expect(payload['healthRecordReminderSpO2'], true);
+  });
+
+  test('notification settings uses a batch metric bottom sheet', () {
+    final source = File(
+      'lib/pages/settings/notification_prefs_page.dart',
+    ).readAsStringSync();
+
+    expect(source, contains('showModalBottomSheet'));
+    expect(source, contains('saveHealthMetrics'));
+    expect(source, contains('提醒指标'));
+  });
+}