Is your feature request related to a problem? Please describe.
The current implementation of the title generation functionality in Open WebUI during chat initiation does not maintain context length (unless keept as default OR model definition contains a num_ctx already that overrides default), which causes the model to be reloaded every time in title generation. This can lead to performance issues and inconvenience for users, as it requires the model to reload with new context length each time a new title is generated during chat initiation, and then subsequent another loading for continuing the chat.

Describe the solution you'd like
I propose enhancing the generate_openai_chat_completion function to maintain context length during title generation when starting a chat. The function should check if the current model has been used before and, if this model is also defined to be used for title generation, use the previously stored context length to avoid reloading the model in ollama backend. This can be achieved in a safe manner by ensuring that if the default num_ctx has not been changed via general settings, no override request is made; otherwise, the same context length is reused as defined there.

Describe alternatives you've considered
An alternative solution would involve modifying the generate_title function to include a separate parameter for the context length. However, this approach would require changes in other parts of the codebase, also it would also necessitate user intervention to manually edit the context length based on the backend's loaded num_ctx for the model.

Additional context
This feature request is relevant for Open WebUI users who frequently generate titles during chat initiation using LLMs. By addressing the current issue with maintaining context length, we can improve overall performance and user experience in this specific use case of using a model for chat and title generation in tandem.