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/youtube_broadcast_activate_job.rb

@@ -0,0 +1,13 @@
+class YoutubeBroadcastActivateJob < ApplicationJob
+  queue_as :default
+
+  def perform(session_id)
+    session = StreamSession.find_by(id: session_id)
+    return unless session&.platform == "youtube"
+    return if session.terminal?
+    return if session.youtube_broadcast_id.blank?
+    return unless Streams::YoutubeRelay.running?(session.id)
+
+    Youtube::BroadcastService.new(session.match.team).activate_broadcast!(session.youtube_broadcast_id)
+  end
+end