Add API endpoints for the POS module:
- GET/POST /api/products/categories - List and create product categories
- GET/POST /api/products - List products with filters and create new products
- GET/PUT/DELETE /api/products/[id] - CRUD operations for individual products
- POST /api/products/[id]/stock - Adjust product stock with validation
Features include:
- Zod validation for all inputs
- Organization-scoped access control
- Low stock indicator (stock < minStock)
- Soft delete for products (isActive = false)
- Stock adjustment with reason tracking
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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