调整统一provider目录；增加content事件的快速登录案例；

app/common/event/AdminLoginType/DemoEvent.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace app\common\event\AdminLoginType;
+
+use think\facade\Env;
+use think\facade\View;
+
+class DemoEvent
+{
+    public function handle()
+    {
+        $content = '';
+
+        if (Env::get('adminsystem.is_demo', false)) {
+            $content = View::layout(false)->fetch('login/ext/demo');
+        }
+
+        // 事件监听处理
+        return [
+            'view_content' => $content,
+        ];
+    }
+}