BritishGeologicalSurvey/pyagsapi ? reverse-engineered prompt

Build me a small web API for working with AGS files, something I can run locally with Docker or from source. It should let me upload AGS files and check that they are valid against the AGS v4.x format, including the extra validation needed for NGDC submission. I also want it to convert back and forth between .ags and .xlsx files, and if possible extract geojson from a submitted file so it can be shown on a simple map.

Please include a clean landing page and Swagger docs, and make sure the app is easy to run on localhost on port 8000. If there are any current library or framework details that matter, look up the latest docs online if you need to. It would be great if the project is set up so I can extend the HTML later and deploy it behind a proxy too.