Use Pydantic AI on the backend so you don't have to keep up with model updates

**Is your feature request related to a problem? Please describe.**
Latest models and/or providers not kept up to date.

**Describe the solution you'd like**
Use the Pydantic AI module on the backend to get lists of models and make calls. See their list of supported providers: https://ai.pydantic.dev/models/overview/
They have a bigger community that keeps this list up-to-date on a daily basis. This is boring stuff that I don't imagine drives you so why not out-source it?

Its primarily an Agent framework (AgentForge in the future?) But they do give you access to their lower level API: https://ai.pydantic.dev/direct/

You might also consider only showing provider/models in your list that there are API keys for.

**Describe alternatives you've considered**
I've stated vibe coding a clone of this project which does this but got bogged down with the front-end stuff. Looking at litegraph.js, now, to solve this problem. Might finish it this Xmas holidays.

**Additional context**
You might also then start looking at structured results as this is the main use case of Pydantic in AI