Stabilizza live YouTube/RTMP e fix crash rotazione mobile.

Pipeline YouTube con relay, overlay e publisher sync lato backend; fix GL pauseGlDuringRotation su Android per evitare crash in rotazione durante lo streaming Flutter.

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

backend/app/jobs/overlay_refresh_job.rb

@@ -27,9 +27,6 @@ class OverlayRefreshJob < ApplicationJob
 
     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
     self.class.set(wait: INTERVAL).perform_later(session_id)
   end
 end