[FEAT] 라이브 공유 기록 · 어드민 통계 · 종료 디스코드 알림 - #277

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/