feat(append): 添加效益测算功能

- 新增 ArgsAppendBenefit 结构体用于传递效益测算参数
- 实现 Benefit 函数以调用远程服务的效益测算功能
- 增加错误处理和回复结构 ReplyBenefitInfo

erp/sale/append.go

@@ -92,3 +92,18 @@ func (a *append) Delete(ctx context.Context, saleProductIds []int64) (err error)
 	reply := 0
 	return xClient.Call(ctx, "Delete", saleProductIds, &reply)
 }
+
+type ArgsAppendBenefit struct {
+	SaleId     int64 // 销售合同id
+	WorkflowId int64 // 审核id
+}
+
+// Benefit @TITLE 效益测算
+func (a *append) Benefit(ctx context.Context, args ArgsAppendBenefit) (reply ReplyBenefitInfo, err error) {
+	xClient, err := client.GetClient(a)
+	if err != nil {
+		return
+	}
+	err = xClient.Call(ctx, "Benefit", args, &reply)
+	return
+}