无法正确设置Linux 软件包镜像源

### Qinglong version

v2.20.1

### Steps to reproduce

<img width="2270" height="1047" alt="Image" src="https://github.com/user-attachments/assets/eebdbbbc-be94-4eef-9ea5-44b0fde5b228" />

### What is expected?

正确添加地址

### What is actually happening?

无法正确设置Linux 软件包镜像源

### System Info

```shell
1panel安装的docker青龙
```

### Any additional comments?

_No response_