[Bug]: external should handle `require.resolve`

### Version

```sh
rslib 0.0.5
```


### Details

<img width="935" alt="image" src="https://github.com/user-attachments/assets/01297f0e-0fea-47a1-b5c6-e6dfeb6d45dc">


### Reproduce link

none

### Reproduce Steps

none