feat: 실시간 대기 번호표 웹앱 초기 커밋

PIN 기반 세션으로 관리자·발급기·표시판 3개 역할을 하나의 앱에서 운영.
Socket.IO 실시간 동기화, Podman Quadlet(10.89.0.25) 배포 구성 포함.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

quadlet/queue.container

@@ -0,0 +1,25 @@
+[Unit]
+Description=Queue Ticket App
+After=podman.service network-online.target proxy-network.service
+Wants=network-online.target
+Requires=podman.service proxy-network.service
+
+[Container]
+ContainerName=queue
+Image=localhost/queue-app:latest
+
+Network=proxy.network
+IP=10.89.0.25
+
+Environment=TZ=Asia/Seoul
+Environment=NODE_ENV=production
+Environment=PORT=3000
+
+Volume=/etc/localtime:/etc/localtime:ro
+
+[Service]
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target