feat: vidu specify reference2video via metadata action

relay/common/relay_utils.go

@@ -59,6 +59,17 @@ func storeTaskRequest(c *gin.Context, info *RelayInfo, action string, requestObj
 	info.Action = action
 	c.Set("task_request", requestObj)
 }
+func GetTaskRequest(c *gin.Context) (TaskSubmitReq, error) {
+	v, exists := c.Get("task_request")
+	if !exists {
+		return TaskSubmitReq{}, fmt.Errorf("request not found in context")
+	}
+	req, ok := v.(TaskSubmitReq)
+	if !ok {
+		return TaskSubmitReq{}, fmt.Errorf("invalid task request type")
+	}
+	return req, nil
+}
 
 func validatePrompt(prompt string) *dto.TaskError {
 	if strings.TrimSpace(prompt) == "" {
@@ -212,18 +223,6 @@ func ValidateBasicTaskRequest(c *gin.Context, info *RelayInfo, action string) *d
 		req.Images = []string{req.Image}
 	}
 
-	if req.HasImage() {
-		action = constant.TaskActionGenerate
-		if info.ChannelType == constant.ChannelTypeVidu {
-			// vidu 增加 首尾帧生视频和参考图生视频
-			if len(req.Images) == 2 {
-				action = constant.TaskActionFirstTailGenerate
-			} else if len(req.Images) > 2 {
-				action = constant.TaskActionReferenceGenerate
-			}
-		}
-	}
-
 	storeTaskRequest(c, info, action, req)
 	return nil
 }