Enhancement: support LiteLLM service account

[stdweird]

What features would you like to see added?

Support LiteLLM service account handling: deploy librechat with an openai style key that is tight to a service account in litellm, and somehow pass the "user" info in the POST. The user value should be obtained after succesful authentication in librechat using eg SSO.
see https://docs.litellm.ai/docs/proxy/service_accounts#3-test-service-account-key (the "succesful call" tab)

More details

I can try to create a patch myself in api/app/clients/ChatGPTClient.js (seems like most likely place, at least for the completions; but this in theory for all possible api calls), but i need some guidance how to detect / can be configured this is wanted behaviour and also a some guidance how to retrieve eg the username after login.

Which components are impacted by your request?

General

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