修改计费文档，加上客户代码

bms-back/bms-system/src/main/java/com/bms/price/domain/PrcBillingTask.java

@@ -17,6 +17,8 @@ public class PrcBillingTask extends BaseEntity
     private String transferNo;
     private String trackingNo;
     private String orderNo;
+    /** Customer code snapshot for filter / rebill */
+    private String customerCode;
     /** PENDING / REBILL / REFUND */
     private String billType;
     /** WAITING / SUCCESS / FAILED */

bms-back/bms-system/src/main/java/com/bms/price/domain/vo/BillingTaskSubmitRequest.java

@@ -18,6 +18,8 @@ public class BillingTaskSubmitRequest implements Serializable
     private String transferNo;
     private String trackingNo;
     private String orderNo;
+    /** Optional customer code; also filled from Oracle when task runs */
+    private String customerCode;
     /** Billing time from mobile; persisted to prc_billing_task.bill_time */
     @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
     private Date billTime;