refactor：拆分 API 路由与请求校验，统一 final 类和代码风格

public/index.php

@@ -1,7 +1,7 @@
 <?php
 
-use Illuminate\Foundation\Application;
 use Illuminate\Http\Request;
+use Illuminate\Foundation\Application;
 
 define('LARAVEL_START', microtime(true));