Aggiunge il mute del microfono in diretta per evitare claim YouTube sulla musica in palestra.

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

backend/spec/services/sessions/set_audio_mute_spec.rb

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+require "rails_helper"
+
+RSpec.describe Sessions::SetAudioMute do
+  let!(:user) { User.create!(email: "mute@test.it", name: "U", password: "Password123", role: "coach") }
+  let!(:club) { Club.create!(name: "C", sport: "volleyball", primary_color: "#e53935", secondary_color: "#ffffff") }
+  let!(:team) { club.teams.create!(name: "T", sport: "volleyball") }
+  let!(:match) { team.matches.create!(opponent_name: "Opp", sport: "volleyball") }
+  let!(:session) { StreamSession.create!(match: match, user: user, platform: "matchlivetv", status: "live") }
+
+  it "attiva il mute e persiste lo stato" do
+    described_class.new(session, muted: true).call
+    expect(session.reload.audio_muted).to eq(true)
+    expect(session.stream_events.order(:occurred_at).last.event_type).to eq("audio_muted")
+  end
+
+  it "disattiva il mute" do
+    session.update!(audio_muted: true)
+    described_class.new(session, muted: false).call
+    expect(session.reload.audio_muted).to eq(false)
+    expect(session.stream_events.order(:occurred_at).last.event_type).to eq("audio_unmuted")
+  end
+
+  it "è idempotente se lo stato è già quello richiesto" do
+    described_class.new(session, muted: false).call
+    expect(session.stream_events.count).to eq(0)
+  end
+end