Initial commit - Zhangmenu Django project

A menu management application built with Django, featuring:
- Dish management with cover images
- Order system with party dates and participants
- REST API with Django REST Framework
- Bootstrap-styled frontend

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

menu/services/order_service.py

@@ -0,0 +1,32 @@
+from django.utils import timezone
+
+from menu.models import Order
+
+
+class OrderService:
+    """订单业务逻辑"""
+
+    @staticmethod
+    def get_queryset(status_filter=None):
+        """获取订单查询集"""
+        queryset = Order.objects.prefetch_related('dishes', 'dishes__category')
+        if status_filter:
+            queryset = queryset.filter(status=status_filter)
+        return queryset
+
+    @staticmethod
+    def create_order(serializer, dish_ids):
+        """创建订单并绑定菜品"""
+        if dish_ids is None:
+            dish_ids = []
+
+        order = serializer.save(dish_ids=dish_ids)
+        return Order.objects.prefetch_related('dishes', 'dishes__category').get(pk=order.pk)
+
+    @staticmethod
+    def complete_order(order):
+        """完成订单"""
+        order.status = 'completed'
+        order.completed_at = timezone.now()
+        order.save()
+        return order