Adds a prioritized security-hardening checklist, a PostgreSQL logical-backup
script (pg-backup.sh) with a documented restore procedure, and Grafana
alerting provisioning (peer-down, flap-storm, RPKI-invalid, router-down rules
plus a contact-point template). The alerting YAML and contact points need
operator review before being relied on for paging.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
