docs(명세): 「제품 흐름 밖 화면」 절을 만들고 /console 을 올린다 (#522 · #594 후속) - #602

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, actions/setup-java@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/