feat: Add Github Copilot or OpenRouter

[username1290]

Any of those would be great, thanks

[lamemate]

https://openrouter.ai/docs/guides/guides/claude-code-integration explains the steps necessary to connect via OpenRouter.

[TomGranot]

Closing as duplicate of #80, which is the canonical issue for alternative runtime support (OpenRouter, Copilot, Codex, Gemini, etc.). Tracking discussion there.