[Enhancement]: Add a "First characters" titleMethod for naming new conversations (no AI call)

[MarArMar]

What features would you like to see added?

In librechat.yml, if I understand correctly today for naming new conversations we currently have access to two "titleMethod" when "titleConvo" is true for custom models, both use the AI : titleMethod: "completion" and "function"

I have conversations with super large context, somehow they all end up with "New chat" as title, I think this is because I use a local LLM that cannot both handle the large request and a second request for a title so it likely timeouts

The first x characters could be sufficient and useful for me to distinguish them instead of only seeing "New chat",

This would not involve calling any AI, simply take the first X characters of a conversation, eventually appending an ellpisis

More details

Many other LLM interface use this method as a default

Also it saves API calls, potentially saving some money or GPU usage for local LLMs.

Which components are impacted by your request?

Other

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