Add support for qui proxy urls for qbittorrent

I tried setting the url to `url = "http://qui:7476/proxy/xxx"` and this threw an error


```
2026-04-16T18:39:50.575346764-05:00 ERROR mlm: Error logging in to qbit http://qui:7476/proxy/xxxx: Login endpoint returned no success status code: 401 Unauthorized
```

