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/api_client.dart

@@ -6,7 +6,7 @@ import 'local_database.dart';
 /// API 基础地址。可通过 --dart-define=API_BASE_URL=http://host:5000 覆盖。
 const String baseUrl = String.fromEnvironment(
   'API_BASE_URL',
-  defaultValue: 'http://10.4.232.251:5000',
+  defaultValue: 'http://192.168.10.139:5000',
 );
 
 class ApiException implements Exception {

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':

health_app/lib/core/navigation_provider.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/widgets.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 /// 路由信息
@@ -39,17 +40,25 @@ final currentRouteProvider = Provider<RouteInfo>((ref) {
   return stack.last;
 });
 
+/// 路由切换前清理键盘焦点，避免返回页面时键盘自动弹起
+void _dismissKeyboard() {
+  FocusManager.instance.primaryFocus?.unfocus();
+}
+
 /// 跳转（替换整个栈）
 void goRoute(WidgetRef ref, String name, {Map<String, String> params = const {}}) {
+  _dismissKeyboard();
   ref.read(routeStackProvider.notifier).replace(name, params: params);
 }
 
 /// 推入新页面
 void pushRoute(WidgetRef ref, String name, {Map<String, String> params = const {}}) {
+  _dismissKeyboard();
   ref.read(routeStackProvider.notifier).push(name, params: params);
 }
 
 /// 返回上一页
 void popRoute(WidgetRef ref) {
+  _dismissKeyboard();
   ref.read(routeStackProvider.notifier).pop();
 }