init

- 框架初始化
 - 安装插件
 - 修复PHP8.4报错

addons/epay/library/v3/Yansongda/Pay/Packer/JsonPacker.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yansongda\Pay\Packer;
+
+use Yansongda\Pay\Contract\PackerInterface;
+
+class JsonPacker implements PackerInterface
+{
+    public function pack(array $payload): string
+    {
+        return json_encode($payload, JSON_UNESCAPED_UNICODE);
+    }
+
+    public function unpack(string $payload): ?array
+    {
+        $data = json_decode($payload, true);
+
+        if (JSON_ERROR_NONE === json_last_error()) {
+            return $data;
+        }
+
+        return null;
+    }
+}