refactor(relay): enhance remix logic for billing context extraction

- Updated the remix handling in ResolveOriginTask to prioritize extracting OtherRatios from the BillingContext of the original task if available.
- Retained the previous logic for extracting seconds and size from task data as a fallback.
- Improved clarity and maintainability of the remix logic by separating the new and old approaches.

relay/relay_task.go

@@ -106,6 +106,13 @@ func ResolveOriginTask(c *gin.Context, info *relaycommon.RelayInfo) *dto.TaskErr
 
 	// 提取 remix 参数（时长、分辨率 → OtherRatios）
 	if info.Action == constant.TaskActionRemix {
+		if originTask.PrivateData.BillingContext != nil {
+			// 新的 remix 逻辑：直接从原始任务的 BillingContext 中提取 OtherRatios（如果存在）
+			for s, f := range originTask.PrivateData.BillingContext.OtherRatios {
+				info.PriceData.AddOtherRatio(s, f)
+			}
+		} else {
+			// 旧的 remix 逻辑：直接从 task data 解析 seconds 和 size（如果存在）
 			var taskData map[string]interface{}
 			_ = common.Unmarshal(originTask.Data, &taskData)
 			secondsStr, _ := taskData["seconds"].(string)
@@ -123,6 +130,7 @@ func ResolveOriginTask(c *gin.Context, info *relaycommon.RelayInfo) *dto.TaskErr
 				info.PriceData.OtherRatios["size"] = 1.666667
 			}
 		}
+	}
 
 	return nil
 }