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/Admin/Settlement/AdminSettlementBatchIndexController.php

@@ -2,11 +2,11 @@
 
 namespace App\Http\Controllers\Api\V1\Admin\Settlement;
 
-use App\Http\Controllers\Controller;
-use App\Models\SettlementBatch;
-use App\Support\AdminApiList;
-use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use App\Support\AdminApiList;
+use App\Models\SettlementBatch;
+use Illuminate\Http\JsonResponse;
+use App\Http\Controllers\Controller;
 
 /**
  * GET /api/v1/admin/settlement-batches — 结算批次分页列表。