协调L3页面，新增合同证书的文件上传逻辑

klp-hrm/src/main/java/com/klp/hrm/domain/HrmContract.java

@@ -25,6 +25,10 @@ public class HrmContract extends BaseEntity implements Serializable {
     private Date endDate;
     private String status;
     private String remark;
+    /**
+     * 合同附件 fileIds（逗号分隔的 OSS ID）
+     */
+    private String fileIds;
     @TableLogic
     private Integer delFlag;
 }