lowcode-demo项目如何开启热重载

clone的官网示例 lowcode-demo 项目，

build.json
````
"devServer": {
"hot": true
}
``

build.plugin.js
```
// config.plugins.delete('hot');
// config.devServer.hot(false);
```

我已经这样设置了，但是修改项目的plugins目录或者任何目录都必须重新npm run start才能看到效果

Start with build.json and build.plugin.js in the lowcode-demo project, then run npm run start and reproduce the need to restart after changing plugins or other files. Trace how the dev server's hot setting is applied. Done means relevant file changes appear without restarting the development server.

Written by the indexing model from the issue text.