MB-13/Finura ? reverse-engineered prompt

Build me a web app called DocTune where someone can sign in, upload a few documents, and tell the app what style they want the writing to sound like. Then it should help them train a small open source model on their own Google Colab GPU, and show them the progress and results in a simple dashboard.

I want a clean front end where users can log in, upload files, manage their dataset, and start a training run. On the backend, handle auth, file storage, background jobs, and saving training info in a database. Make sure the app can send emails, run workers in the background, and expose a basic API with docs. Use local storage for files for now, but keep it easy to swap later.

Please set it up so I can run everything locally with Docker, and include the notebook part for the Colab training flow too. If you need to check current docs for any libraries or integrations, do that.