Jason Staack 4ae39d2cb3 feat(02-01): add config backup env vars, NATS event, device SSH fields, migration, metrics ...

- Config: CONFIG_BACKUP_INTERVAL (21600s), CONFIG_BACKUP_MAX_CONCURRENT (10), CONFIG_BACKUP_COMMAND_TIMEOUT (60s)
- NATS: ConfigSnapshotEvent type, PublishConfigSnapshot method, config.snapshot.> stream subject
- Device: SSHPort/SSHHostKeyFingerprint fields, UpdateSSHHostKey method, updated queries/scans
- Migration 028: ssh_port, ssh_host_key_fingerprint, timestamp columns with poller_user grants
- Metrics: ConfigBackupTotal (counter), ConfigBackupDuration (histogram), ConfigBackupActive (gauge)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-12 20:48:12 -05:00

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