feat: AtchaV2 Phase 6 — 홈 개편 (더미 제거 + 위치 권한 + 검색 연결 + 알람 등록) - #344

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/