Revert "fix: [tenant-console] 테넌트 콘솔 분리작업"

This reverts commit 8da1702e

app/Http/Controllers/DepartmentPermissionController.php

@@ -2,7 +2,6 @@
 
 namespace App\Http\Controllers;
 
-use App\Helpers\TenantHelper;
 use App\Models\Tenants\Department;
 use App\Models\Tenants\Tenant;
 use App\Services\DepartmentPermissionService;
@@ -22,7 +21,7 @@ public function __construct(DepartmentPermissionService $departmentPermissionSer
      */
     public function index(Request $request)
     {
-        $tenantId = TenantHelper::getRawTenantId();
+        $tenantId = session('selected_tenant_id');
 
         // 부서 목록 조회
         $departmentsQuery = Department::query()->orderBy('tenant_id')->orderBy('sort_order')->orderBy('name');