v2.0.0 — 검색 엔진 교체, 저장소 재설계, UI 개편, 다국어, AI 에이전트 연동 - #21

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/upload-artifact@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/