chore(compose-test-setup): 補上範本預期的 compose.yaml 與 test 服務，讓需要 DB／MQ 的後端測試（含驗收）能以 docker compose --env-file .env -f .worktrees/<id>/compose.yaml run --rm test 在本機跑 - #97

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

setup-java v4 is deprecated and will no longer receive updates. Please migrate to actions/setup-java@v5.