Implement ollama protocol support in the r2ai webserver

[trufae]

https://github.com/ollama/ollama/blob/main/docs/api.md

[trufae]

done, at least enough endpoints are implemented to make some clients work, we can extend the support further. The biggest issue right now is the lack of realtime responses, a requests only responds when the full reply is completed