[Feature]: support of OpenRouter for access to other models

[didier-durand]

Hi,

Many Open Weoghts models are now as powerful as those of Anthropic.

So, could you, please, add support for models served by OpenRouter: we could then use Qwen, Kimi, MiniMax and compare results. (Note: OpenRouter also serves Anthropic)

I asked that to other LLM-based projects and they could add it very easily: OpenRouter supports OpenAI (and corresponding Python SDK) 100%.

Thanks in advance!

Didier