feat(ops): add automated backup restore verification
Adds pg-verify-backup.sh that restores the latest backup to an isolated
test database and verifies integrity (table existence, row counts, key
checksums, PostGIS extension, indexes, enum types). Reports pass/fail
with optional JSON output.
- Cron schedule: daily at 04:00 UTC (2h after backup)
- On-demand: docker compose run --rm pg-verify-backup
- CI: weekly GitHub Actions workflow with artifact upload
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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