YouTube live immediata: relay sempre attivo e attivazione broadcast.

Il relay parte dal job overlay ogni 2s; scheduledStartTime ~90s invece di 5 min;
transition testing/live quando l'ingest RTMP raggiunge YouTube.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/jobs/overlay_refresh_job.rb

@@ -26,6 +26,9 @@ class OverlayRefreshJob < ApplicationJob
     return self.class.cancel_chain(session_id) unless Streams::OverlayRelay.running?(session_id)
 
     Streams::Overlay::Refresh.call(session)
+    if session.platform == "youtube"
+      Streams::YoutubeRelay.ensure_publishing!(session)
+    end
     self.class.set(wait: INTERVAL).perform_later(session_id)
   end
 end