feat: 对齐常驻商城与七鱼客服交互

- 同步商城 H5 登录态与原生 token
- 完善商城/原生 tab 切换、动画及返回交互
- 修复七鱼客服键盘避让和状态栏恢复
- 调整开屏跳过按钮与登录入口交互

lib/common/services/cache_clear_service.dart

@@ -5,6 +5,7 @@ import 'package:flutter_cache_manager/flutter_cache_manager.dart';
 import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:package_info_plus/package_info_plus.dart';
 
+import '../../features/web/application/mall_web_host_controller.dart';
 import '../storage/storage_service.dart';
 
 /// Clears only disposable presentation data. Credentials and user preferences
@@ -14,6 +15,7 @@ class CacheClearService {
 
   static Future<void> clear() async {
     await DefaultCacheManager().emptyCache();
+    await MallWebHostController.instance.clear();
     await SplashAdControllerPlaceholder.clear();
   }