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/Dashboard/AdminDashboardController.php

@@ -2,13 +2,13 @@
 
 namespace App\Http\Controllers\Api\V1\Admin\Dashboard;
 
-use App\Http\Controllers\Controller;
-use App\Lottery\ErrorCode;
 use App\Models\AdminUser;
-use App\Services\Admin\AdminDashboardSnapshotBuilder;
+use App\Lottery\ErrorCode;
 use App\Support\ApiResponse;
-use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Http\JsonResponse;
+use App\Http\Controllers\Controller;
+use App\Services\Admin\AdminDashboardSnapshotBuilder;
 
 /**
  * GET /api/v1/admin/dashboard — 首页仪表盘聚合数据（需登录；按权限返回子块）。