feat: 配置 WebView 数据目录，优化 WebView 性能；更新 homeUrl 方法以支持更好的 URL 生成逻辑

test/widget_test.dart

@@ -11,16 +11,20 @@ void main() {
     );
   });
 
-  test('passes shell branding name and logo to the H5 URL', () {
+  test('loads the configured H5 root URL with shell branding', () {
     const logo = 'data:image/png;base64,abc+/=';
 
     final uri = Uri.parse(
       AppConfig.homeUrl(appName: 'Shell Test', appLogo: logo),
     );
 
+    expect(uri.scheme, 'https');
+    expect(uri.host, 'h5-im.imharry.work');
+    expect(uri.path, '/');
     expect(uri.queryParameters['flutter_shell'], '1');
     expect(uri.queryParameters['shell_app_name'], 'Shell Test');
     expect(uri.queryParameters.containsKey('shell_app_logo'), isFalse);
+    expect(uri.queryParameters['shell_cache_bust'], isNotEmpty);
     expect(uri.toString(), isNot(contains('%25')));
     expect(Uri.splitQueryString(uri.fragment)['shell_app_logo'], logo);
   });