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

app/Http/Controllers/Api/V1/Player/PingController.php

@@ -2,15 +2,15 @@
 
 namespace App\Http\Controllers\Api\V1\Player;
 
-use App\Http\Controllers\Controller;
 use App\Support\ApiResponse;
 use Illuminate\Http\JsonResponse;
+use App\Http\Controllers\Controller;
 
 /**
  * 无需登录：仅供网关/前端确认「玩家 API 前缀」可达。
  * 路由：GET /api/v1/player/ping
  */
-class PingController extends Controller
+final class PingController extends Controller
 {
     public function __invoke(): JsonResponse
     {