feat: S07 Server 실행 조율 통합 (1.74~1.87) — merge 보류 - #241

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

TEST-com.proovy.integration.brain.ServerBrainIntegrationTest tests="18" skipped="18" failures="0" errors="0" — run scripts/brain-integration/run-local.sh locally (README)

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