docs: Update progress and SOP with CRUD pattern
Updated documentation with latest progress and standardized CRUD pattern.
PROGRESS_NOTE.md Updates:
- Email notification enhancements (variable dropdown, card reorganization)
- Card styling fixes (success = green, not purple)
- List support verification
- Product CRUD backend API complete (600+ lines)
- All endpoints: list, get, create, update, delete
- Full variant support for variable products
- Categories, tags, attributes endpoints
PROJECT_SOP.md Updates:
- Added Section 6.9: CRUD Module Pattern (Standard Template)
- Complete file structure template
- Backend API pattern with code examples
- Frontend index/create/edit page patterns
- Comprehensive checklist for new modules
- Based on Orders module analysis
- Ready to use for Products, Customers, Coupons, etc.
Benefits:
- Consistent pattern across all modules
- Faster development (copy-paste template)
- Standardized UX and code structure
- Clear checklist for implementation
- Reference implementation documented
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