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/DrawResultsIndexController.php

@@ -2,29 +2,32 @@
 
 namespace App\Http\Controllers\Api\V1\Draw;
 
+use App\Models\Draw;
+use App\Support\ApiResponse;
+use Illuminate\Http\Request;
+use App\Models\DrawResultBatch;
+use App\Support\PaginationTrait;
+use Illuminate\Http\JsonResponse;
 use App\Http\Controllers\Controller;
 use App\Lottery\DrawResultBatchStatus;
-use App\Models\Draw;
-use App\Models\DrawResultBatch;
 use App\Services\Draw\DrawResultViewService;
-use App\Support\ApiResponse;
 use Illuminate\Contracts\Pagination\LengthAwarePaginator;
-use Illuminate\Http\JsonResponse;
-use Illuminate\Http\Request;
 
 /**
  * `GET /api/v1/draw/results` — 已发布开奖往期（公开；对齐 PRD `/api/v1/results`）。
  */
-class DrawResultsIndexController extends Controller
+final class DrawResultsIndexController extends Controller
 {
+    use PaginationTrait;
+
     public function __construct(
         private readonly DrawResultViewService $viewer,
     ) {}
 
     public function __invoke(Request $request): JsonResponse
     {
-        $perPage = max(1, min(50, (int) $request->query('size', $request->query('per_page', 15))));
-        $page = max(1, (int) $request->query('page', 1));
+        $perPage = $this->perPage($request, 'size', 15, 50);
+        $page = $this->page($request);
         /** @var string|null $bizDate query `business_date` 或旧的 `date` */
         $bizDate = $request->query('business_date') ?? $request->query('date');