Enhancement: more easier way for user to add custom provider

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What features would you like to see added?

add a custom provider button in ui

More details

im a user using web ui for librechat,and i found their is no choice for my provider and their is no way to add it but to set up this proj from begining ,but i just wanna to using more cheaper openai provider,and many other proj like u support this feature ,like big-agi,chatbox etc

Which components are impacted by your request?

UI

Pictures

No response

Code of Conduct

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