added ordering of orders

backend/database.py

@@ -25,8 +25,8 @@ class OrderDatabase:
         return order
     
     def get_all_orders(self) -> List[Order]:
-        """Get all orders."""
-        return list(self.orders.values())
+        """Get all orders sorted by order date (oldest first)."""
+        return sorted(self.orders.values(), key=lambda order: order.order_date)
     
     def get_order_by_id(self, order_id: str) -> Optional[Order]:
         """Get a specific order by ID."""