Implementa pausa diretta con copertina slate e ripresa.

Metti in pausa ferma RTMP lato app mantenendo la camera aperta, MediaMTX
manda offline.mp4 agli spettatori e Chiudi termina definitivamente.

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

backend/app/services/sessions/resume.rb

@@ -0,0 +1,32 @@
+module Sessions
+  class Resume
+    def initialize(session)
+      @session = session
+    end
+
+    def call
+      unless @session.paused?
+        raise Teams::EntitlementError.new("La sessione non è in pausa", code: "not_paused")
+      end
+
+      cancel_timeout_job
+      @session.begin_connect! if @session.may_begin_connect?
+      log_event("resumed")
+      SessionChannel.broadcast_message(@session, { type: "command", action: "resume_stream" })
+      @session
+    end
+
+    private
+
+    def cancel_timeout_job
+      return if @session.timeout_job_id.blank?
+
+      Sidekiq::ScheduledSet.new.find_job(@session.timeout_job_id)&.delete
+      @session.update!(timeout_job_id: nil)
+    end
+
+    def log_event(type)
+      @session.stream_events.create!(event_type: type, occurred_at: Time.current, metadata: {})
+    end
+  end
+end