feat(admin): 新增限流器 add rate limiting middleware for backend

- Add rate limiting functionality to the admin panel
- Implement rate limiting middleware to control API request frequency
- Update login controller to use rate limiting Add helper functions for getting IP and admin UID
- Update route configuration to include rate limiting middleware
- Add Redis configuration to .env file
- Update composer.json to include rate limiting package dependency

app/common/utils/Helper.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace app\common\utils;
+
+class Helper
+{
+
+    /**
+     * 获取当前IP地址
+     * @return string
+     */
+    public static function getIp(): string
+    {
+        return request()->ip();
+    }
+
+    /**
+     * 获取当前登录用户ID
+     * @return int|string
+     */
+    public static function getAdminUid(): int|string
+    {
+        return session('admin.id') ?: 0;
+    }
+
+}