[v0.1] vLLM Semantic Router Operator Support

[Xunzhuo]

Adding operator pattern support to vLLM Semantic Router, to largely simplify the UX for automation to model eval, envoy and router startup, observability etc.

similiar to:

1. aiconfigurator: https://github.com/ai-dynamo/aiconfigurator
2. ome: https://github.com/sgl-project/ome

refer to: https://lmsys.org/blog/2025-07-08-ome/

[Xunzhuo]

This needs a design doc around it, and i think this is a big milestone for UX.

[rootfs]

@Xunzhuo Thanks for this great idea!

[Xunzhuo]

/assign