[WIP] Implementación de Shopping Cart

[Copilot]

Shopping Cart Implementation Plan

Implementing Shopping Cart functionality for the OctoCAT Supply Chain Management application.

Implementation Checklist:

Phase 1: Backend API Implementation

• Create Cart and CartItem models with Swagger documentation
• Create cart routes with REST endpoints (POST /cart, GET /cart, etc.)
• Add cart routes to main API server
• Add cart seed data and integrate with existing API structure
• Complete parameterized cart routes (GET /cart/:id, POST /cart/:id/items, etc.) - postponed due to TypeScript router issues

Phase 2: Frontend Context and State Management

• Create CartContext for global cart state management
• Create cart-related API functions for frontend
• Update product quantity handling to use cart context

Phase 3: UI Components

• Create CartIcon component for navigation (shows item count)
• Create CartPage component for cart management
• Update Navigation component to include CartIcon
• Update Products component to use CartContext instead of alert
• Add cart route to App routing

Phase 4: Business Logic and Validation

• Add stock validation when adding items to cart
• Implement cart totals calculation (basic done in context)
• Add checkout functionality
• Add proper error handling and user feedback

Phase 5: Testing and Documentation

• Create unit tests for cart API endpoints
• Test cart functionality end-to-end
• Update API documentation
• Take screenshots of UI changes

Current Status:
✅ Repository explored, build system working, existing code structure understood
✅ Backend models and basic API endpoints implemented and compiling successfully
✅ Complete frontend cart implementation with context, API integration, and UI components
✅ Navigation updated with cart icon showing item count
✅ Products page integrated with cart functionality
✅ Cart page with full cart management capabilities

Next: Test the implementation end-to-end and add remaining backend routes

Fixes #1.

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