Add OrderStatus to Django admin with Russian translations

- Add OrderStatusAdmin to admin panel with custom display methods
- Implement color preview, order badge, and order count displays
- Protect system statuses from deletion and code modification
- Add orders_count property to OrderStatus model
- Create migration to translate status names to Russian
- Use format_html for safe HTML rendering in admin

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

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

myproject/orders/models.py

@@ -99,6 +99,11 @@ class OrderStatus(models.Model):
     def __str__(self):
         return self.name
 
+    @property
+    def orders_count(self):
+        """Количество заказов в этом статусе"""
+        return self.orders.count()
+
 
 class Address(models.Model):
     """