+CanSwitch2SelfDeliver，美团预定单是不能转自送的

减小转自送失败尝试时间间隙至3秒（以免出现不能取消三方运单的情况）

business/partner/partner.go

@@ -190,6 +190,10 @@ func (p *BasePurchasePlatform) GetStatusActionTimeout(order *model.GoodsOrder, s
 	return params
 }
 
+func (c *BasePurchasePlatform) CanSwitch2SelfDeliver(order *model.GoodsOrder) (isCan bool, err error) {
+	return true, nil
+}
+
 func init() {
 	PurchasePlatformHandlers = make(map[int]IPurchasePlatformHandler)
 	PurchaseOrderHandlers = make(map[int]IPurchasePlatformOrderHandler)