feat: 优化 H5 URL 生成逻辑，移除品牌参数；更新测试用例以反映更改

lib/config/app_config.dart

@@ -21,39 +21,25 @@ class AppConfig {
     final host = environmentHosts.isNotEmpty
         ? environmentHosts.first
         : 'h5-im.imharry.work';
-    return withFreshShellParams(
-      _normalizeHomeUrl(host),
-      appName: appName,
-      appLogo: appLogo,
-    );
+    return withFreshShellParams(_normalizeHomeUrl(host));
   }
 
-  static String withFreshShellParams(
-    String url, {
-    String? appName,
-    String? appLogo,
-  }) {
+  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();
+    queryParameters.remove('shell_app_name');
+    queryParameters.remove('shell_app_logo');
     final fragmentParameters = Uri.splitQueryString(uri.fragment);
-
-    final trimmedName = (appName ?? AppConfig.appName).trim();
-    if (trimmedName.isNotEmpty) {
-      queryParameters['shell_app_name'] = trimmedName;
-    }
-
-    final trimmedLogo = (appLogo ?? AppConfig.appLogo).trim();
-    if (trimmedLogo.isNotEmpty) {
-      fragmentParameters['shell_app_logo'] = trimmedLogo;
-    }
+    fragmentParameters.remove('shell_app_name');
+    fragmentParameters.remove('shell_app_logo');
 
     return uri
         .replace(
           queryParameters: queryParameters,
           fragment: fragmentParameters.isEmpty
-              ? null
+              ? ''
               : Uri(queryParameters: fragmentParameters).query,
         )
         .toString();