Ability to set a separate endpoint for generating titles

[jameslamine]

Right now, the title has to be generated by the same endpoint which the chat uses. But I have an endpoint without any small models, and I'd rather not use a large expensive model for generating the title.

Could you support a titleEndpoint parameter, in addition to the titleModel parameter? This is for custom endpoints.

[jameslamine]

Alternatively, could you make it so I can set separate custom headers and addParams for the title model? Like titleAddParams and titleHeaders. That would also solve my issue.