Risolve timeout creazione sessione YouTube lato app.

La setup broadcast YouTube (~23s) passa in background job; l'API risponde
subito. Aumentato anche il timeout Dio mobile per createSession YouTube.

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

backend/app/services/sessions/create.rb

@@ -27,10 +27,10 @@ module Sessions
         status: "idle"
       )
 
+      youtube_channel = nil
       if session.platform == "youtube"
         youtube_channel = @params[:youtube_channel].presence
         assert_youtube_channel!(youtube_channel)
-        attach_youtube_broadcast!(session, youtube_channel: youtube_channel)
       end
 
       StreamSession.transaction do
@@ -40,10 +40,13 @@ module Sessions
         mtx.create_path(session)
         mtx.create_overlay_path(session)
         start_overlay_relay(session)
-        start_youtube_relay(session)
         log_event(session, "pairing", { created: true, platform: session.platform })
       end
 
+      if session.platform == "youtube"
+        YoutubeBroadcastSetupJob.perform_later(session.id, youtube_channel)
+      end
+
       session
     end
 
@@ -60,18 +63,7 @@ module Sessions
     end
 
     def attach_youtube_broadcast!(session, youtube_channel: nil)
-      yt = Youtube::BroadcastService.new(session.match.team, youtube_channel: youtube_channel)
-      title = "#{session.match.team.name} vs #{session.match.opponent_name}"
-      broadcast = yt.create_broadcast!(
-        title: title,
-        privacy_status: session.privacy_status,
-        scheduled_at: session.match.scheduled_at
-      )
-
-      session.youtube_broadcast_id = broadcast[:broadcast_id]
-      session.youtube_stream_id = broadcast[:stream_id]
-      session.stream_key = broadcast[:stream_key]
-      session.rtmp_url = broadcast[:rtmp_url]
+      Youtube::SetupBroadcast.call(session, youtube_channel: youtube_channel)
     end
 
     def start_overlay_relay(session)
@@ -80,14 +72,6 @@ module Sessions
       Rails.logger.warn("[Sessions::Create] Overlay relay: #{e.message}")
     end
 
-    def start_youtube_relay(session)
-      return unless session.platform == "youtube"
-
-      Streams::YoutubeRelay.start(session)
-    rescue Streams::YoutubeRelay::Error => e
-      Rails.logger.warn("[Sessions::Create] YouTube relay: #{e.message}")
-    end
-
     def log_event(session, type, metadata)
       session.stream_events.create!(event_type: type, metadata: metadata, occurred_at: Time.current)
     end