feat(media): 视频渠道 - 新增 Novita 异步视频生成协议

Co-authored-by: jax-novita <jax-novita@users.noreply.github.com>
Original-PR: https://github.com/ddcat-ai/open-ai-canvas/pull/206

backend/internal/model/models.go

@@ -73,6 +73,7 @@ const (
 	ChannelInterfaceVolcengineArkVideo    ChannelInterfaceType = "volcengine-ark-video"
 	ChannelInterfaceVolcengineJiMengVideo ChannelInterfaceType = "volcengine-jimeng-video"
 	ChannelInterfaceGeminiVeo             ChannelInterfaceType = "gemini-veo"
+	ChannelInterfaceNovitaVideo           ChannelInterfaceType = "novita-video"
 
 	ApiCallStatusSucceeded ApiCallStatus = "succeeded"
 	ApiCallStatusFailed    ApiCallStatus = "failed"