androashish007-lgtm/PortableLM ? reverse-engineered prompt

Build me a portable offline AI app that I can run from a USB drive or local folder, without installing anything on the host machine. I want it to work on Windows, Mac, Linux, and Android, with simple start and install scripts for each platform, so I can launch a local chat interface in the browser and talk to my models completely offline.

It should keep model files, chat history, and the portable runtime in a shared folder so I only have to download everything once. Please make it easy to drop in GGUF models from Hugging Face too, and let the app choose the right local engine for each device, including CPU and GPU acceleration when available. If you need to check current docs or best practices for portable local AI setups, go ahead and look them up online.