SiaLabs/Free-API-Server ? reverse-engineered prompt

Build me a small API server that lets me use Google Gemini through a simple OpenAI style interface, without needing an API key. I want to be able to point an OpenAI client at it, send normal chat requests, get streaming replies, and also generate images from a prompt.

It should run easily with Docker, listen on port 3897, and use the Gemini cookies from my browser session as the login, so I can paste in the two cookie values and get started quickly. Please include a basic docs page for the endpoints, and make sure I can list the available models and use it with common OpenAI compatible tools. If anything needs current setup details from the web, look them up as you go.