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>

backend/app/config.py

@@ -0,0 +1,11 @@
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    database_url: str = "postgresql://postgres:postgres@db:5432/food_prices"
+    ah_client_id: str = "appie"
+
+    model_config = {"env_file": ".env"}
+
+
+settings = Settings()