[fix] increase Kling API polling timeout to prevent user timeouts (#8860)

Extends polling duration from 10 minutes to ~68 minutes (256 attempts × 16 seconds) to accommodate longer Kling API operations that were frequently timing out for users.

comfy_api_nodes/nodes_kling.py

@@ -132,6 +132,8 @@ def poll_until_finished(
         result_url_extractor=result_url_extractor,
         estimated_duration=estimated_duration,
         node_id=node_id,
+        poll_interval=16.0,
+        max_poll_attempts=256,
     ).execute()