json的效果可以优化下

对比：
1. `mogan`软件：

<img width="884" height="429" alt="Image" src="https://github.com/user-attachments/assets/fcc422e0-4926-477c-a59a-069d09436a61" />


2. 在线网站`https://www.json.cn/`：

<img width="577" height="249" alt="Image" src="https://github.com/user-attachments/assets/a9740833-f371-483e-80c3-61935335d408" />
