benaabenna/geopulse-rs ? reverse-engineered prompt

Build me a simple Flask app called GeoPulse RS with a clean web page and a small API.

I want it to feel like a real product, not a demo, so the main page should load from templates and show a clear interface for working with location based data. Add a few useful routes for the API, basic error handling, and a simple structure that makes it easy to grow later. Keep the app easy to run locally, with everything wired up from the main Python file and the needed dependencies listed correctly.

If you need to look up current Flask best practices or docs online, go ahead. Make the code tidy and readable, and include anything needed so I can start it right away and see the site working in a browser.