M0NARCH001/final ? reverse-engineered prompt

Build me NutriMate v2, a personalized nutrition tracker with a mobile app and a backend API.

I want users to sign up with just a username, enter basic body info and health conditions, then get daily calorie and nutrient targets calculated automatically. The app should show a dashboard with calories, macros, and key micronutrients like fiber, sodium, sugar, iron, calcium, vitamin C, and folate, plus clear warnings when something is too high or too low.

Also add food search and logging, barcode scanning for products, and the ability to pull nutrition info from OpenFoodFacts and save new products if they are not already in the system. Include smart food recommendations that try to fill nutrient gaps and learn from what users actually accept over time.

Please make it work end to end with the mobile app, FastAPI backend, SQLite storage, and the ML recommendation flow. If you need to check current docs for Expo or FastAPI, look them up online.