- Added new fields 'billing_cycle' and 'product_pricing_id' to Cart and OrderItem models.
- Updated product retrieval logic to support both new and legacy systems.
- Introduced relationships for Product and ProductPricings in Cart and OrderItem models.
- Created migration to add new fields to the carts and order_item tables.
- Updated frontend service index to handle new pricing structure and billing cycles.
- Improved UI components for better user experience in product selection and pricing display.
- Refactored action buttons in various views for consistency and improved styling.
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