chore: 添加静态资源文件和版本配置文件

添加大量图片、字体、音频等静态资源文件，包括用户界面图片、模板文件和安装界面素材
添加系统版本配置文件(.version)和常量定义文件(.constant)
更新供应商依赖文件，包括Symfony VarDumper组件和相关许可证文件
添加验证码配置文件(captcha.php)和.gitignore规则

app/http/middleware/StationOpenMiddleware.php

@@ -0,0 +1,32 @@
+<?php
+// +----------------------------------------------------------------------
+// | CRMEB [ CRMEB赋能开发者，助力企业发展 ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2016~2026 https://www.crmeb.com All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed CRMEB并不是自由软件，未经许可不能去掉CRMEB相关版权
+// +----------------------------------------------------------------------
+// | Author: CRMEB Team <admin@crmeb.com>
+// +----------------------------------------------------------------------
+
+namespace app\http\middleware;
+
+
+use app\Request;
+use crmeb\interfaces\MiddlewareInterface;
+
+/**
+ * 站点升级
+ * Class StationOpenMiddleware
+ * @package app\api\middleware
+ */
+class StationOpenMiddleware implements MiddlewareInterface
+{
+    public function handle(Request $request, \Closure $next)
+    {
+        if (!sys_config('station_open', true)) {
+            return app('json')->make(410010, '站点升级中，请稍候访问');
+        }
+        return $next($request);
+    }
+}