chore: 全面规范化代码，遵循 CLAUDE.md 编码规范

- C# 文件命名改为 snake_case（28 个文件重命名）
- C# 类转换为主构造函数（8 个类）
- 空 catch 添加异常类型（2 处）
- 新建 GlobalUsings.cs（Health.Infrastructure、Health.WebApi）
- Flutter 移除 go_router，改用 Riverpod 路由栈
- Flutter 移除 flutter_secure_storage，改用 sqflite 持久化
- 修复 Flutter 构建路径（Flutter SDK 迁至 D 盘）
- 后端端口改为 0.0.0.0:5000，支持局域网访问

health_app/lib/pages/settings/settings_pages.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:go_router/go_router.dart';
+import '../../core/navigation_provider.dart';
 import '../../providers/auth_provider.dart';
 
 /// 设置页
@@ -10,17 +10,17 @@ class SettingsPage extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) => Scaffold(
     appBar: AppBar(title: const Text('设置')),
     body: ListView(children: [
-      _SetItem(icon: Icons.shield, title: '隐私保护中心', onTap: () => context.push('/page/privacy')),
-      _SetItem(icon: Icons.notifications, title: '通知偏好', onTap: () => context.push('/settings/notifications')),
+      _SetItem(icon: Icons.shield, title: '隐私保护中心', onTap: () => pushRoute(ref, 'staticText', params: {'type': 'privacy'})),
+      _SetItem(icon: Icons.notifications, title: '通知偏好', onTap: () => pushRoute(ref, 'notificationPrefs')),
       _SetItem(icon: Icons.text_fields, title: '字体大小', trailing: _FontSlider()),
-      _SetItem(icon: Icons.article, title: '协议与公告', onTap: () => context.push('/page/terms')),
-      _SetItem(icon: Icons.info, title: '关于', onTap: () => context.push('/page/about')),
+      _SetItem(icon: Icons.article, title: '协议与公告', onTap: () => pushRoute(ref, 'staticText', params: {'type': 'terms'})),
+      _SetItem(icon: Icons.info, title: '关于', onTap: () => pushRoute(ref, 'staticText', params: {'type': 'about'})),
       const Divider(),
       _SetItem(icon: Icons.logout, title: '退出登录', textColor: const Color(0xFFE53935), onTap: () async {
         final ok = await showDialog<bool>(context: context, builder: (ctx) => AlertDialog(
           title: const Text('退出登录'), content: const Text('确定退出？'),
           actions: [TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('取消')), TextButton(onPressed: () => Navigator.pop(ctx, true), child: const Text('确定'))]));
-        if (ok == true) { await ref.read(authProvider.notifier).logout(); if (context.mounted) context.go('/login'); }
+        if (ok == true) { await ref.read(authProvider.notifier).logout(); goRoute(ref, 'login'); }
       }),
     ]),
   );