Add Support for OpenRouter

[peterhoang]

Is your feature request related to a problem? Please describe.
I'm trying to use https://ai-sdk.dev/providers/community-providers/openrouter with BlockNote, but it doesn't seem compatible. I think because openrouter's sdk uses "v2" LLM instead of "v1".

Describe the solution you'd like
AI integration with latest openrouter ai-sdk.

Describe alternatives you've considered
Use another editor framework? Worse case, write custom code for ProseMirror (or Tiptap)

[YousefED]

We'll add support for this next week / week after

What are you building @peterhoang ? Always eager to learn

[peterhoang]

Thanks for the updates. I'm trying to build myself something similar to NovelCrafter.