Add support for Open WebUI API

[z2rec]

Is your feature request related to a problem? Please describe.
I use local ollama with Open WebUI as it's interface and I share access with my family and connect to it remotely over reverse proxy. Currently exposing ollama is risky as there is no authentication needed and another problem is that any chats are not saved into Open WebUI.

Describe the solution you'd like
Option to use WebUI API with API key to limit the access to specific user and have ability to see your previous chats.

Describe alternatives you've considered
If that is not possible maybe an option to add API-Key header to Ollama request so I can at least filter requests without appropriate key using nginx.

Additional context
https://openwebui.com/