1.新增菜单后台操作指南，方便管理员查看使用

server/plugin/saiadmin/app/controller/system/SystemAdminGuideController.php

@@ -0,0 +1,49 @@
+<?php
+// +----------------------------------------------------------------------
+// | saiadmin [ saiadmin快速开发框架 ]
+// +----------------------------------------------------------------------
+namespace plugin\saiadmin\app\controller\system;
+
+use plugin\saiadmin\app\logic\system\SystemAdminGuideLogic;
+use plugin\saiadmin\basic\BaseController;
+use plugin\saiadmin\service\Permission;
+use support\Request;
+use support\Response;
+
+/**
+ * 后台操作指南控制器
+ */
+class SystemAdminGuideController extends BaseController
+{
+    private SystemAdminGuideLogic $guideLogic;
+
+    public function __construct()
+    {
+        $this->guideLogic = new SystemAdminGuideLogic();
+        parent::__construct();
+    }
+
+    /**
+     * 读取后台操作指南 Markdown 内容
+     */
+    #[Permission('后台操作指南读取', 'system:admin_guide:index:read')]
+    public function read(Request $request): Response
+    {
+        $data = $this->guideLogic->read();
+        return $this->success($data);
+    }
+
+    /**
+     * 保存后台操作指南 Markdown 内容
+     */
+    #[Permission('后台操作指南保存', 'system:admin_guide:index:save')]
+    public function save(Request $request): Response
+    {
+        $content = $request->post('content', '');
+        if (! is_string($content)) {
+            return $this->fail('invalid content');
+        }
+        $data = $this->guideLogic->save($content);
+        return $this->success($data, 'save success');
+    }
+}