v3.0.0

Major Changes in v3.0.0:

1. Consolidated all routes into a single main.py file
2. Implemented proper SQLAlchemy database models
3. Added complete CRUD operations for:
   • Customers
   • Products
   • Customer Accounts
   • Orders
4. Improved error handling and input validation
5. Switched to SQLite database for better portability
6. Removed redundant files (app.py and routes.py)

This release represents a major refactoring of the codebase for better organization and maintainability.