feat: wan 2.7 support N for gen images number

relay/channel/ali/image.go

@@ -181,6 +181,7 @@ func oaiFormEdit2AliImageEdit(c *gin.Context, info *relaycommon.RelayInfo, reque
 		},
 	}
 	imageRequest.Parameters = AliImageParameters{
+		N:         int(lo.FromPtrOr(request.N, uint(1))),
 		Watermark: request.Watermark,
 	}
 	return &imageRequest, nil