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/Draw/DrawCurrentController.php

@@ -2,16 +2,16 @@
 
 namespace App\Http\Controllers\Api\V1\Draw;
 
+use App\Support\ApiResponse;
+use Illuminate\Http\Request;
+use Illuminate\Http\JsonResponse;
 use App\Http\Controllers\Controller;
 use App\Services\Draw\DrawHallSnapshotBuilder;
-use App\Support\ApiResponse;
-use Illuminate\Http\JsonResponse;
-use Illuminate\Http\Request;
 
 /**
  * 下注大厅：`GET /api/v1/draw/current`。
  */
-class DrawCurrentController extends Controller
+final class DrawCurrentController extends Controller
 {
     public function __construct(
         private readonly DrawHallSnapshotBuilder $snapshot,