Implement flexible order status management system

Features:
- Created OrderStatus model for managing statuses per tenant
- Added system-level statuses: draft, new, confirmed, in_assembly, in_delivery, completed, return, cancelled
- Implemented CRUD views for managing order statuses
- Created OrderStatusService with status transitions and business logic hooks
- Updated Order model to use ForeignKey to OrderStatus
- Added is_returned flag for tracking returned orders
- Updated filters to work with new OrderStatus model
- Created management command for status initialization
- Added HTML templates for status list, form, and confirmation
- Fixed views.py to use OrderStatus instead of removed STATUS_CHOICES

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

myproject/orders/urls.py

@@ -15,4 +15,10 @@ urlpatterns = [
     path('<int:pk>/autosave/', views.autosave_draft_order, name='order-autosave'),
     path('create-draft/', views.create_draft_from_form, name='order-create-draft'),
     path('api/customer-address-history/', views.get_customer_address_history, name='api-customer-address-history'),
+
+    # Order Status Management URLs
+    path('statuses/', views.order_status_list, name='status_list'),
+    path('statuses/create/', views.order_status_create, name='status_create'),
+    path('statuses/<int:pk>/edit/', views.order_status_update, name='status_edit'),
+    path('statuses/<int:pk>/delete/', views.order_status_delete, name='status_delete'),
 ]