HuggingChat Omni Support 🤗

[Xunzhuo]

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

Add support for HuggingChat Omni, providing seamless integration with vLLM Semantic Router

Upstream issue: huggingface/chat-ui#1947

[Xunzhuo]

/p1
/milestone v0.1
/area core user-experience

cc @LysandreJik

[rootfs]

For Chat UI, this is the repo https://github.com/huggingface/chat-ui

[Xunzhuo]

Great @rootfs let's schedule high priority to land this 🍻