Initial project scaffold

Full-stack Dutch supermarket price tracker with FastAPI backend,
PostgreSQL/SQLAlchemy, Albert Heijn scraper, and Next.js frontend.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,5 @@
+# Backend — copy to backend/.env for local dev
+DATABASE_URL=postgresql://postgres:postgres@localhost:5432/food_prices
+
+# Frontend — copy to frontend/.env.local for local dev
+NEXT_PUBLIC_API_URL=http://localhost:8000