Changes
- #1049 feat: cluster config model + Postgres plugin state detection
- #1050 feat: template apply/revert controller for composable Postgres features
- #1051 feat: live HA cluster scaling controller
- #1052 feat: railway postgres pitr — point-in-time recovery management
- #1055 feat: persistent ops trail + upgrade guidance for railway postgres
- #1053 feat: railway postgres ha — high-availability cluster management
- #1054 feat: railway postgres pgbouncer — connection pooling management