init

- 框架初始化
 - 安装插件
 - 修复PHP8.4报错

addons/epay/library/v3/Yansongda/Pay/Contract/ConfigInterface.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yansongda\Pay\Contract;
+
+interface ConfigInterface
+{
+    /**
+     * @param mixed $default default value of the entry when does not found
+     *
+     * @return mixed
+     */
+    public function get(string $key, $default = null);
+
+    public function has(string $key): bool;
+
+    /**
+     * @param mixed $value
+     */
+    public function set(string $key, $value): void;
+}