fix(merchant): 进件回到渠道商直属普通商户，去掉 head 层级

yeg

2026-09-15 e89a164e2b0667e613253c578ef289714901336d

 talent-card-server/src/main/java/com/talentcard/server/business/payment/huifu/HuifuIndividualOnboardingCommand.java

@@ -20,7 +20,5 @@
        String bankProvinceCode,
        String bankCityCode,
        String bankCode,
        String settlementCardFrontPictureId,
        /** 平台自己的汇付号：非空则把该商户建成平台的下级商户（head_office_flag=0 + head_huifu_id）。 */
        String parentHuifuId
        String settlementCardFrontPictureId
) {}