feat: 增强玩家管理功能，集成接入站点权限控制

在多个玩家相关控制器中引入 AdminSiteScope，确保管理员在执行操作前具备相应的接入站点权限。更新 Player 相关请求以支持 site_code 参数，增强权限验证逻辑，确保系统安全性与灵活性。同时，新增 AdminUser 模型方法以获取可访问的站点 ID 列表，优化权限管理。

app/Http/Controllers/Api/V1/Admin/Integration/AdminIntegrationSiteIndexController.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\Admin\Integration;
+
+use App\Support\ApiResponse;
+use Illuminate\Http\Request;
+use Illuminate\Http\JsonResponse;
+use App\Http\Controllers\Controller;
+use App\Support\AdminIntegrationSiteAccess;
+use App\Support\AdminIntegrationSitePresenter;
+
+final class AdminIntegrationSiteIndexController extends Controller
+{
+    public function __invoke(Request $request): JsonResponse
+    {
+        $admin = $request->lotteryAdmin();
+        abort_if($admin === null, 401);
+
+        $items = AdminIntegrationSiteAccess::queryFor($admin)
+            ->get()
+            ->map(static fn ($site): array => AdminIntegrationSitePresenter::listItem($site))
+            ->all();
+
+        return ApiResponse::success(['items' => $items]);
+    }
+}