feat: 商品变更，增加供应商绑定

yanxuan-qc-change-system-biz/src/main/java/com/netease/mail/yanxuan/change/biz/biz/ChangeFlowBiz.java

@@ -188,6 +188,13 @@ public class ChangeFlowBiz {
     private String createProductChangeFlow(ChangeFlowCreateReq changeFlowCreateReq, String uid, String name) {
         // 商品变更：校验商品不能为空
         Assert.isTrue(StringUtils.isNotBlank(changeFlowCreateReq.getChangeItems()), "变更商品不可为空");
+        // 商品变更需要关联供应商
+        if (CreateSourceEnum.TONG_ZHOU.getType().equals(changeFlowCreateReq.getCreateSource())) {
+            // 供应商发起：取当前人为供应商
+            changeFlowCreateReq.setChangeSupplier(uid);
+        } else {
+            Assert.isTrue(StringUtils.isNotBlank(changeFlowCreateReq.getChangeSupplier()), "变更供应商不可为空");
+        }
         // 解析商品ID列表
         List<Long> itemIds = parseItemIds(changeFlowCreateReq.getChangeItems());
         // 执行公共创建流程（内部已处理邮件逻辑）
@@ -539,6 +546,8 @@ public class ChangeFlowBiz {
             // 当变更类型是商品时有值
             changeRecord.setChangeItem(changeFlowCreateReq.getChangeItems());
             changeRecord.setChangeSku(changeFlowCreateReq.getChangeSkus());
+            // 商品变更需要关联供应商
+            changeRecord.setChangeSupplier(changeFlowCreateReq.getChangeSupplier());
         }
         if (ChangeSubjectEnum.SUPPLIER.getType().equals(changeFlowCreateReq.getChangeSubject())) {
             changeRecord.setChangeSupplier(changeFlowCreateReq.getChangeSupplier());