AcceptSheetContext
销售品赠送接口参数
客户标识用户标识赠送销售品信息列表赠送来源
accept
OfferRelationHandleService
赠送销售品信息
销售品标识销售品优先级销售品价格计划赠送时长赠送方式（插入，叠加）
convert orders
config offer relation
offerRelationHandleService
configOfferRelation
OfferAcceptService
present()
OrderContext
assemble offer info
OfferOrderService
offerOrderService
assembleOrder
