Fix YouTube waiting: transcode verso RTMP e sync stato live.

Il relay non usa più copy (stream inactive su YouTube); PublisherSync
nel refresh overlay; activate solo quando lo stream YouTube è active.

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

backend/app/jobs/overlay_refresh_job.rb

@@ -26,6 +26,7 @@ class OverlayRefreshJob < ApplicationJob
     return self.class.cancel_chain(session_id) unless Streams::OverlayRelay.running?(session_id)
 
     Streams::Overlay::Refresh.call(session)
+    Mediamtx::PublisherSync.new(session).call if session.status.in?(%w[connecting reconnecting live paused])
     if session.platform == "youtube"
       Streams::YoutubeRelay.ensure_publishing!(session)
     end