Renamed FoodItems to FoodItem and Units to Unit in models.py, updated related imports and usage throughout the codebase. Added a barcode scanner test page using ZXing in the admin section. Improved food_items.html to display nutritional information in a table. Registered the admin blueprint in app.py and cleaned up blueprint registration in __init__.py. Updated seed.py to use the new FoodItem model.
Add base Flask application with user authentication, SQLAlchemy models for users, units, and food items, admin blueprint, and basic templates. Includes database migration setup, login form, and seed script for initial user creation.
