refactor：用 AdminApiList 统一后台列表类接口的响应格式

app/Http/Controllers/Api/V1/Admin/User/AdminUserShowController.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\Admin\User;
+
+use App\Http\Controllers\Controller;
+use App\Models\AdminUser;
+use App\Support\AdminUserApiPresenter;
+use App\Support\ApiResponse;
+use Illuminate\Http\JsonResponse;
+
+/** GET /api/v1/admin/admin-users/{admin_user} */
+final class AdminUserShowController extends Controller
+{
+    public function __invoke(AdminUser $admin_user): JsonResponse
+    {
+        $admin_user->load('roles');
+
+        return ApiResponse::success(AdminUserApiPresenter::listItem($admin_user));
+    }
+}