feat: 어드민 API 인증/인가 및 OWNER 권한 관리 구현 - #59

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v3, actions/checkout@v3, actions/setup-java@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

This action is running on a pull_request event for a fork repository. It cannot do anything useful like creating check runs or pull request comments. To run the action on fork repository pull requests, see https://github.com/EnricoMi/publish-unit-test-result-action/blob/v1.20/README.md#support-fork-repositories-and-dependabot-branches

setup-java v3 is deprecated and will no longer receive updates. Please migrate to actions/setup-java@v5.