fix(openrouter): forward attribution headers into LiteLLM requests#4

coniferconcepts merged 1 commit intomainconiferconcepts/LLM-API-Key-Proxy:mainfrom

fix/openrouter-attribution-headers-prconiferconcepts/LLM-API-Key-Proxy:fix/openrouter-attribution-headers-prCopy head branch name to clipboard