fix(refund): 更新退款成功状态码判断逻辑

- 将退款成功状态码从"BBS0000"更改为"000000"
- 确保与最新的退款接口响应格式保持一致

model/refund.go

@@ -70,5 +70,5 @@ type RefundRespData struct {
 
 // SuccessOrFail 判断退款交易是否成功
 func (r *RefundResponse) SuccessOrFail() bool {
-	return r.Code == "BBS00000"
+	return r.Code == "000000"
 }