- Added `Order` and `OrderItem` models with migrations for managing orders and their details
- Created `CheckoutForm` for validating order data and customer information
- Built templates for order confirmation, checkout success, and emails (HTML and plain text)
- Added logic for email notifications upon successful order placement
- Enhanced shopping cart template with checkout panel integration
- Updated styles and JavaScript for streamlined checkout UX
- Refactored cart view to support item summaries and final totals during checkout
