feat: Add presence heartbeat for Matrix online status

- matrix-gateway: POST /internal/matrix/presence/online endpoint
- usePresenceHeartbeat hook with activity tracking
- Auto away after 5 min inactivity
- Offline on page close/visibility change
- Integrated in MatrixChatRoom component

scripts/stop-all.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# ============================================================================
+# Stop DAARION ALL-IN-ONE Stack
+# Phase INFRA
+# ============================================================================
+
+echo "🛑 Stopping DAARION ALL-IN-ONE Stack..."
+docker-compose -f docker-compose.all.yml down
+
+echo ""
+echo "✅ All services stopped"
+echo ""
+echo "To remove volumes (⚠️  WARNING: This will delete all data):"
+echo "  docker-compose -f docker-compose.all.yml down -v"
+echo ""
+