feat: AI 对话附件上下文解析 + 历史会话归档 + 多页面 UI 重构

- 后端: 新增 AttachmentContextBuilder 解析图片/PDF 摘要并拼入 LLM 上下文; ai_chat_endpoints 扩展附件接口; 新增 ReportAnalysisService
- 前端: 新增历史会话页与 conversation_history_provider; chat 链路支持附件展示与回放
- UI: 重构 medication_checkin / notification_center / profile / health_drawer 等多页面
- 配置: api_client baseUrl 适配当前 WiFi IP

health_app/lib/core/app_router.dart

@@ -13,6 +13,7 @@ import '../pages/consultation/consultation_pages.dart';
 import '../pages/settings/settings_pages.dart';
 import '../pages/settings/notification_prefs_page.dart';
 import '../pages/notifications/notification_center_page.dart';
+import '../pages/history/conversation_history_page.dart';
 import '../pages/profile/profile_page.dart';
 import '../pages/diet/diet_capture_page.dart';
 import '../pages/device/device_scan_page.dart';
@@ -67,7 +68,7 @@ Widget buildPage(RouteInfo route, WidgetRef ref) {
     case 'exercisePlan':
       return const ExercisePlanPage();
     case 'exercisePlanDetail':
-      return ExercisePlanDetailPage(id: params['id'] ?? '');
+      return const ExercisePlanPage();
     case 'exerciseCreate':
       return const ExercisePlanCreatePage();
     case 'dietRecords':
@@ -102,6 +103,8 @@ Widget buildPage(RouteInfo route, WidgetRef ref) {
       return const NotificationPrefsPage();
     case 'notifications':
       return const NotificationCenterPage();
+    case 'conversationHistory':
+      return const ConversationHistoryPage();
     case 'staticText':
       return StaticTextPage(type: params['type']!);
     case 'dietDetail':