Fix ProductKit admin queryset error

Change from ProductKit.all_objects.all() to super().get_queryset()
since ProductKit model doesn't have an all_objects manager.

Fixes AttributeError: type object 'ProductKit' has no attribute 'all_objects'

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

myproject/products/admin.py

@@ -568,8 +568,8 @@ class ProductKitAdmin(admin.ModelAdmin):
     get_order_link.short_description = "Заказ"
 
     def get_queryset(self, request):
-        """Переопределяем queryset для доступа ко всем комплектам (включая удаленные)"""
-        qs = ProductKit.all_objects.all()
+        """Переопределяем queryset для доступа ко всем комплектам"""
+        qs = super().get_queryset(request)
         ordering = self.get_ordering(request)
         if ordering:
             qs = qs.order_by(*ordering)