feat: UI 系统中心化 + 趋势图重构 + 法律文档 H5 上线

- UI 系统: 新增 design_tokens / module_visuals / app_buttons / app_status_badge / app_toast / ai_content 六个共享模块; 28 个页面接入, SnackBar 全部替换为 AppToast
- 趋势图: 直线折线 + 渐变填充 + 阴影; 去网格线; X 轴日+月份分隔; Y 轴整数刻度最多 4 个; 点击数据点/录入记录显示上方浮层, 选中点变实心
- 法律文档 H5: 后端 wwwroot 托管隐私政策/服务协议/关于/个人信息收集清单/第三方 SDK 清单 + 索引页; Program.cs 启用 UseDefaultFiles + UseStaticFiles
- 其他: auth_provider 登录流程调整; api_client IP 适配; 主页智能体栏间距优化

health_app/lib/core/app_router.dart

@@ -28,6 +28,18 @@ import '../pages/doctor/doctor_profile_page.dart';
 import '../pages/admin/admin_home_page.dart';
 import '../pages/admin/admin_add_doctor_page.dart';
 import '../providers/auth_provider.dart' show userRoleProvider;
+import '../widgets/app_error_state.dart';
+
+Widget _missingParamPage() {
+  return const Scaffold(
+    body: AppErrorState(title: '页面参数错误', subtitle: '缺少打开页面所需的信息，请返回后重试'),
+  );
+}
+
+String? _requiredParam(Map<String, String> params, String key) {
+  final value = params[key]?.trim();
+  return value == null || value.isEmpty ? null : value;
+}
 
 /// 根据路由信息返回对应页面
 Widget buildPage(RouteInfo route, WidgetRef ref) {
@@ -59,7 +71,8 @@ Widget buildPage(RouteInfo route, WidgetRef ref) {
     case 'reports':
       return const ReportListPage();
     case 'aiAnalysis':
-      return AiAnalysisPage(id: params['id']!);
+      final id = _requiredParam(params, 'id');
+      return id == null ? _missingParamPage() : AiAnalysisPage(id: id);
     case 'reportOriginal':
       return ReportOriginalPage(
         url: params['url'] ?? '',
@@ -82,13 +95,17 @@ Widget buildPage(RouteInfo route, WidgetRef ref) {
     case 'doctorSettings':
       return const DoctorSettingsPage();
     case 'doctorPatientDetail':
-      return DoctorPatientDetailPage(id: params['id']!);
+      final id = _requiredParam(params, 'id');
+      return id == null ? _missingParamPage() : DoctorPatientDetailPage(id: id);
     case 'doctorChat':
-      return DoctorChatPage(id: params['id']!);
+      final id = _requiredParam(params, 'id');
+      return id == null ? _missingParamPage() : DoctorChatPage(id: id);
     case 'doctorReportDetail':
-      return DoctorReportDetailPage(id: params['id']!);
+      final id = _requiredParam(params, 'id');
+      return id == null ? _missingParamPage() : DoctorReportDetailPage(id: id);
     case 'doctorFollowUpEdit':
-      return DoctorFollowUpEditPage(id: params['id']!);
+      final id = _requiredParam(params, 'id');
+      return id == null ? _missingParamPage() : DoctorFollowUpEditPage(id: id);
     case 'devices':
       return const DeviceManagementPage();
     case 'deviceScan':
@@ -106,9 +123,11 @@ Widget buildPage(RouteInfo route, WidgetRef ref) {
     case 'conversationHistory':
       return const ConversationHistoryPage();
     case 'staticText':
-      return StaticTextPage(type: params['type']!);
+      final type = _requiredParam(params, 'type');
+      return type == null ? _missingParamPage() : StaticTextPage(type: type);
     case 'dietDetail':
-      return DietRecordDetailPage(id: params['id']!);
+      final id = _requiredParam(params, 'id');
+      return id == null ? _missingParamPage() : DietRecordDetailPage(id: id);
     default:
       return const LoginPage();
   }