Fix YouTube in attesa: disabilita auto_stop e ricrea broadcast chiusa

YouTube chiudeva la diretta (complete) senza ingest stabile; ora
enable_auto_stop è false e SetupBroadcast.recreate! rigenera link/stream key.

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

backend/app/jobs/youtube_broadcast_activate_job.rb

@@ -19,6 +19,11 @@ class YoutubeBroadcastActivateJob < ApplicationJob
     result = Youtube::BroadcastService.new(session.match.team).activate_broadcast!(session.youtube_broadcast_id)
     return if result == :live || result == :transitioned
 
+    if result == :broadcast_ended
+      Youtube::SetupBroadcast.recreate!(session.reload)
+      return
+    end
+
     return unless result == :waiting_ingest
     return if attempt >= MAX_ATTEMPTS