Replaces the four inline obs steps with one uses: ./.gitea/actions/deploy-obs, and the Caddy reload + smoke test with one uses: each (host staging.raddatz.cloud, postgres_host archiv-staging-db-1, STAGING_* secrets). checkout@v4 stays the first step; the #526 /import mount guard stays inline. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>