Add n8n community node, /api/v1/render alias, and job webhooks for OSS automation.

Payment-free self-hosted builds keep full API access with optional webhookUrl callbacks and the published n8n-nodes-songs2vid package source under integrations/n8n.

lib/types.ts

@@ -94,6 +94,8 @@ export type CreateJobPayload = {
     audioFilename: string;
     metadata: ItemMetadata;
   }>;
+  /** Absolute http(s) URL — Songs2VID POSTs JSON on item/job terminal states (n8n). */
+  webhookUrl?: string | null;
   /** Create a new playlist and attach its ID to every item (Pro). */
   createPlaylist?: CreatePlaylistRequest | null;
 };