feat: 新增验证码接口

app/admin/controller/v1/Captcha.php

@@ -0,0 +1,21 @@
+<?php
+declare (strict_types = 0);
+
+namespace app\admin\controller\v1;
+
+use think\facade\Config;
+
+class Captcha
+{
+    /**
+     * 获取验证码
+     */
+    public function index(\think\Config $config, \think\Session $session)
+    {
+        // 输出验证码
+        $captcha = new \think\captcha\Captcha($config, $session);
+        $data = $captcha->create();
+       
+        return success('获取验证码成功！', $data["img"]);
+    }
+}