feat(e2e): autologin patch (dev) + 登录态路由测试脚本

- util_web devAutologin: localStorage[_test_token]=user|pass -> 登录API写Hive+dispatch currentUser
- 延迟3s执行等 Flutter/Hive ready (否则 httpPost hang)
- main.dart 调用 devAutologin
- run_auth.js: 注入token遍历登录态路由
- 已验证: autologin API 200 OK

lib/utils/util_io.dart

@@ -199,6 +199,9 @@ class Util {
     return box;
   }
 
+  /// DEV ONLY stub (原生不自动登录)
+  static void devAutologin() {}
+
   static Widget showImage(String imageUrl, {double? width, double? height,
     BoxFit? fit, Widget Function(BuildContext, String, dynamic)? errorWidget}) {
     if (imageUrl != null && imageUrl.isNotEmpty && imageUrl.startsWith('https:')) {