Merge branch 'feature/stream-audio-mute' into collaudo

Integra il mute del microfono in diretta per il collaudo.

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

backend/app/services/sessions/set_audio_mute.rb

@@ -0,0 +1,28 @@
+module Sessions
+  # Silenzia o riattiva il microfono della camera in onda.
+  # Lo stream continua a inviare AAC silenzioso (YouTube/MediaMTX richiedono la traccia audio).
+  class SetAudioMute
+    def initialize(session, muted:)
+      @session = session
+      @muted = ActiveModel::Type::Boolean.new.cast(muted)
+    end
+
+    def call
+      return @session if @session.audio_muted == @muted
+
+      @session.update!(audio_muted: @muted)
+      action = @muted ? "mute_audio" : "unmute_audio"
+      event_type = @muted ? "audio_muted" : "audio_unmuted"
+      log_event(event_type)
+      SessionChannel.broadcast_message(@session, { type: "command", action: action, muted: @muted })
+      SessionChannel.broadcast_message(@session, { type: "stream_event", event: "audio_muted", muted: @muted })
+      @session
+    end
+
+    private
+
+    def log_event(type)
+      @session.stream_events.create!(event_type: type, occurred_at: Time.current, metadata: { muted: @muted })
+    end
+  end
+end