thinkphp无法加载模块 index

return [
    // 模块路径配置
    'module' => [
        'path' => [APP_PATH . 'index/'],
    ],
];

application/
├── index/
│   ├── controller/
│   │   └── Index.php
│   ├── model/
│   │   └── Index.php
│   └── index.php

namespace app\index\controller;

use think\Controller;

class Index extends Controller
{
    public function index()
    {
        return 'Hello, ThinkPHP!';
    }
}

use think\Route;

Route::get('/', 'index/index/index');

namespace app\index\controller;

use think\Controller;

class Index extends Controller
{
    public function index()
    {
        return 'Hello, ThinkPHP!';
    }
}

use think\Route;

Route::get('/', 'index/index/index');