Simplify order creation and editing - remove autosave

- Removed autosave.js (665 lines) and draft-creator.js (441 lines)
- Removed draft_service.py (~500 lines) and DraftOrderService
- Removed AJAX endpoints: autosave and create-draft
- Updated order_create() to add is_create_page flag
- Updated order_update() to finalize drafts without DraftOrderService
- Added get_new_status() method to OrderStatusService
- Updated order_form.html:
  - Removed old JS includes
  - Added beforeunload warning for unsaved data
  - Updated buttons: separate buttons for create/draft/finalize
- Total code reduction: ~1600 lines (92% removed)

New workflow:
- /orders/create/ - user fills form, chooses button
- /orders/<id>/edit/ - simple editing without autosave
- beforeunload warning when leaving page (except on submit)

myproject/orders/services/order_status_service.py

@@ -27,6 +27,21 @@ class OrderStatusService:
         except OrderStatus.DoesNotExist:
             return None
 
+    @staticmethod
+    def get_new_status():
+        """Возвращает системный статус 'new' (новый заказ)"""
+        status, created = OrderStatus.objects.get_or_create(
+            code='new',
+            defaults={
+                'name': 'Новый',
+                'label': 'Новый',
+                'is_system': True,
+                'color': '#0d6efd',
+                'order': 10,
+            }
+        )
+        return status
+
     @staticmethod
     def get_system_status(code):
         """Получить системный статус по коду"""