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

includes/Api/Routes.php

@@ -17,6 +17,7 @@ use WooNooW\Api\DeveloperController;
 use WooNooW\Api\SystemController;
 use WooNooW\Api\NotificationsController;
 use WooNooW\Api\ActivityLogController;
+use WooNooW\Api\ProductsController;
 
 class Routes {
     public static function init() {
@@ -89,6 +90,9 @@ class Routes {
             // Activity Log controller
             $activity_log_controller = new ActivityLogController();
             $activity_log_controller->register_routes();
+            
+            // Products controller
+            ProductsController::register_routes();
         });
     }
 }