[Enhancement]: Allow templating the user key in LLM requests

[mrh-chain]

What features would you like to see added?

I am looking for a way to use templating for the value provided as the user key in requests to the LLM backend. By default it sets the users ID, but for my use-case I need to set the users email so as to correlate it with actual users in my LLM inference API.

Adding an option to use the users email as the value is perhaps a bit too narrowly scoped, so I believe that allowing one to use templating to set it to any attribute of the user (or a static value?) is the most useful approach.

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Which components are impacted by your request?

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[danny-avila]

the specific user key cannot be templated at the moment with other fields at the moment, but you can customize the outgoing headers with user info (this documentation change is still updating in the live site):

LibreChat-AI/librechat.ai@8a4376f

[mrh-chain]

Amazing, thank you!