feature: implement ollama provider

[dlants]

Did you check the docs?

• I have read all the docs

Is your feature request related to a problem? Please describe.

Should probably add local provider support, probably via https://github.com/ollama/ollama-js

Describe the solution you'd like

.

Describe alternatives you've considered

.

Additional context

No response

[trashhalo]

As long as you let users override the openai base URL you already support ollama https://ollama.com/blog/openai-compatibility

As well as openrouter and litellm. Since they all speak openai api

I think that's the best bang for your buck for supporting more models.