feat: 更新 WebView 数据目录，添加持久存储清理逻辑；优化 URL 生成和 H5 路由刷新时的品牌保持

test/widget_test.dart

@@ -28,4 +28,23 @@ void main() {
     expect(uri.toString(), isNot(contains('%25')));
     expect(Uri.splitQueryString(uri.fragment)['shell_app_logo'], logo);
   });
+
+  test('keeps shell branding when refreshing an H5 route URL', () {
+    const logo = 'data:image/png;base64,routeLogo+/=';
+
+    final uri = Uri.parse(
+      AppConfig.withFreshShellParams(
+        'https://h5-im.imharry.work/login?from=runtime',
+        appName: 'Shell Route',
+        appLogo: logo,
+      ),
+    );
+
+    expect(uri.path, '/login');
+    expect(uri.queryParameters['from'], 'runtime');
+    expect(uri.queryParameters['flutter_shell'], '1');
+    expect(uri.queryParameters['shell_app_name'], 'Shell Route');
+    expect(uri.queryParameters['shell_cache_bust'], isNotEmpty);
+    expect(Uri.splitQueryString(uri.fragment)['shell_app_logo'], logo);
+  });
 }