Allow the first-boot admin account to be configured via ADMIN_EMAIL and ADMIN_PASSWORD environment variables. If both are set the account is created with those credentials; otherwise the existing random-password fallback is used. Documented across .env.example, docker-compose.yml, Helm chart (values.yaml, secret.yaml, deployment.yaml), and CLAUDE.md. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>