MikMik1011/bgpp — reverse-engineered prompt

Build me a simple open source web app for checking bus arrivals in the biggest Serbian cities, Belgrade, Novi Sad, and Nis. I want it to feel fast and easy on both phone and desktop, with a clean page where someone can choose a city, find a stop, and quickly see the next bus arrivals in a clear list.

Please include the backend part too, so the app uses its own proxy to talk to the official transport data instead of relying on the public hosted instance. Keep the usage respectful and aligned with the fair use policy, so it is suitable for self hosting for personal use, research, or testing. A lightweight frontend with a small server is fine.

Make it easy to run locally and also easy to deploy as a small hosted app. If anything about the transport API needs checking, look up current docs or examples online and wire it up in the simplest reliable way.