统一发货口径并保护结果数据

backend/internal/service/fulfillment_state.go

@@ -86,11 +86,11 @@ func validateOrderStatusTransition(order *model.FulfillmentOrder, next string, k
 		if next == model.OrderStatusPaid || next == model.OrderStatusCancelled {
 			return nil
 		}
-		return errors.New("订单未支付，不能履约")
+		return errors.New("订单未支付，不能发货")
 	case model.OrderStatusCancelled:
 		return errors.New("订单已取消，不能更新状态")
 	case model.OrderStatusDelivered:
-		return errors.New("订单已履约成功，不能回退状态")
+		return errors.New("订单已交付，不能回退状态")
 	}
 	switch next {
 	case model.OrderStatusDelivering:
@@ -105,7 +105,7 @@ func validateOrderStatusTransition(order *model.FulfillmentOrder, next string, k
 		}
 	case model.OrderStatusShipFailed:
 		if kind == fulfillmentTransitionTimeout && current != model.OrderStatusDelivering {
-			return errors.New("只有履约中的订单可以标记超时")
+			return errors.New("只有发货中的订单可以标记超时")
 		}
 		if current == model.OrderStatusPaid ||
 			current == model.OrderStatusShipFailed ||
@@ -134,7 +134,7 @@ func canCancelOrder(order *model.FulfillmentOrder) error {
 	case model.OrderStatusPending:
 		return errors.New("订单未支付，不能取消")
 	case model.OrderStatusDelivering, model.OrderStatusDelivered:
-		return errors.New("订单已进入履约流程，不能取消")
+		return errors.New("订单已进入发货流程，不能取消")
 	default:
 		return errors.New("订单当前状态不能取消")
 	}