-- 附加服务 / 渠道偏远分区
-- 字典种子由前端 dict-batch-import 同步；AI Skill 由应用首次 list/get 幂等写入。

ALTER TABLE `t_sales_product`
  ADD COLUMN `AdditionalServices` VARCHAR(512) NULL COMMENT '可选附加服务字典code JSON数组' AFTER `TradeTerms`;

ALTER TABLE `t_order`
  ADD COLUMN `AdditionalServices` VARCHAR(512) NULL COMMENT '客户勾选附加服务字典code JSON数组' AFTER `IsRemote`;

ALTER TABLE `t_service_channel`
  ADD COLUMN `RemoteAreaId` INT NULL COMMENT '偏远分区KPI AreaId' AFTER `Description`;