ArghyaBhattacharya123/NetraPulse ? reverse-engineered prompt

Build me a complete app for analyzing eye fundus images and helping spot diabetic retinopathy.

I want to be able to upload a fundus image, have it processed, run through a classifier, and then get a clear result with an explanation of what the model focused on. It should feel like a simple demo app for someone to use without needing to know anything about machine learning.

Please include the full flow, image preprocessing, model inference, and some kind of visual explanation overlay or heatmap. If useful, add a way to generate synthetic or hard negative examples for testing, and make the demo easy to run locally with a web interface and supporting backend services.

Keep it polished, practical, and easy to understand, and look up current docs online if you need to.