feat: 移除 H5 URL 中的品牌参数和缓存参数；更新测试用例以反映更改

lib/config/app_config.dart

@@ -21,14 +21,14 @@ class AppConfig {
     final host = environmentHosts.isNotEmpty
         ? environmentHosts.first
         : 'h5-im.imharry.work';
-    return withFreshShellParams(_normalizeHomeUrl(host));
+    return _normalizeHomeUrl(host);
   }
 
   static String withFreshShellParams(String url) {
     final uri = Uri.parse(url);
-    final queryParameters = Map<String, String>.from(uri.queryParameters)
-      ..['flutter_shell'] = '1'
-      ..['shell_cache_bust'] = DateTime.now().millisecondsSinceEpoch.toString();
+    final queryParameters = Map<String, String>.from(uri.queryParameters);
+    queryParameters.remove('flutter_shell');
+    queryParameters.remove('shell_cache_bust');
     queryParameters.remove('shell_app_name');
     queryParameters.remove('shell_app_logo');
     final fragmentParameters = Uri.splitQueryString(uri.fragment);