YouTube come destinazione pubblica, non Match Live TV.

Non propone più il link MLTV per sessioni YouTube; la pagina /live
reindirizza a YouTube; il relay verso YouTube si riavvia al connect.

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

backend/app/services/youtube/setup_broadcast.rb

@@ -39,6 +39,15 @@ module Youtube
         metadata: { broadcast_id: broadcast[:broadcast_id] },
         occurred_at: Time.current
       )
+      SessionChannel.broadcast_message(
+        @session,
+        {
+          type: "youtube_ready",
+          youtube_watch_url: @session.youtube_watch_url,
+          share_url: @session.share_url,
+          youtube_broadcast_id: @session.youtube_broadcast_id
+        }
+      )
       @session
     rescue BroadcastService::Error => e
       @session.stream_events.create!(