Aggiunge overlay server-side burn-in e stabilizza diretta live.

Tabellone, badge e brand sono ricodificati nel flusso _air via OverlayRelay;
sync punteggio HTTP, volume condiviso rails/sidekiq, qualità 720p migliorata
e badge CONNECTING in ripresa da pausa.

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

backend/app/services/webhooks/mediamtx_handler.rb

@@ -25,21 +25,26 @@ module Webhooks
     def handle_connect(session)
       return if session.paused?
 
+      Streams::OverlayRelay.ensure_publishing!(session)
+
       return if session.live? && session.stream_events.where(event_type: "connected").exists?
 
       if session.reconnecting?
         session.reconnect! if session.may_reconnect?
+        enable_recording(session)
         cancel_timeout(session)
         log(session, "reconnected")
         broadcast(session, "reconnected")
       elsif session.connecting? || session.idle?
         session.go_live! if session.may_go_live?
+        enable_recording(session)
         log(session, "connected")
         broadcast(session, "connected")
       end
     end
 
     def handle_disconnect(session)
+      disable_recording(session)
       return if session.paused?
       return unless session.live? || session.connecting?
 
@@ -57,6 +62,20 @@ module Webhooks
       log(session, "connected", { ready: true })
     end
 
+    def enable_recording(session)
+      return unless session.match.team.entitlements.recording_enabled_for_mediamtx?
+
+      Mediamtx::Client.new.set_path_recording(session, enabled: true)
+    rescue Mediamtx::Client::Error => e
+      Rails.logger.warn("[MediamtxHandler] enable recording: #{e.message}")
+    end
+
+    def disable_recording(session)
+      Mediamtx::Client.new.set_path_recording(session, enabled: false)
+    rescue Mediamtx::Client::Error => e
+      Rails.logger.warn("[MediamtxHandler] disable recording: #{e.message}")
+    end
+
     def schedule_timeout(session)
       job = DisconnectionTimeoutJob.perform_in(
         MatchLiveTv.reconnect_timeout_seconds.seconds,
@@ -92,6 +111,7 @@ module Webhooks
 
     def broadcast(session, event)
       SessionChannel.broadcast_message(session, { type: "stream_event", event: event })
+      Streams::Overlay::Refresh.call(session)
     end
   end
 end