feat:(feature/REQ-3581) 变更签证记录增加合同id返回

visa/visa-api/src/main/java/cn/axzo/nanopart/visa/api/response/VisaSearchResp.java

@@ -146,4 +146,9 @@ public class VisaSearchResp {
      * @see VisaStampStatusEnum
      */
     private String stampStatus;
+
+    /**
+     * 合同id
+     */
+    private String contractId;
 }