init

- 框架初始化
 - 安装插件
 - 修复PHP8.4报错

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

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yansongda\Pay\Contract;
+
+interface PackerInterface
+{
+    public function pack(array $payload): string;
+
+    public function unpack(string $payload): ?array;
+}