Fix registrazione replay in produzione via PublisherSync.

MediaMTX distroless non invoca i webhook wget: accendiamo record sul path quando il telefono pubblica RTMP e lo spegniamo in pausa/offline.

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

backend/app/services/sessions/pause.rb

@@ -7,6 +7,12 @@ module Sessions
     def call
       cancel_timeout_job
       @session.pause! if @session.may_pause?
+      Mediamtx::PublisherSync.forget_recording_state!(@session.id)
+      begin
+        Mediamtx::Client.new.set_path_recording(@session, enabled: false)
+      rescue Mediamtx::Client::Error => e
+        Rails.logger.warn("[Sessions::Pause] disable recording: #{e.message}")
+      end
       Mediamtx::Client.new.set_always_available(@session, enabled: true)
       # Slate su path per HLS in pausa; RTMP telefono si ferma via comando app.
       log_event("paused")