[Feature Request] LLM support custom API URL and persist/export chat history


Here are some cases where a custom request URL might be necessary:

* When Ollama isn't deployed on your local machine.
* When a model is available from multiple providers, especially open-source models. Providers include Groq, Together.ai, Fireworks, etc.

The chat history will be lost when the page is closed. Please consider adding support for saving and exporting the history.