docs(backup-monitor): replace UI-click workflow tasks with JSON file approach
- Add JS code files + Ruby build script + Python validator to file map
- Replace Tasks 7-9 (UI clicks) with Tasks 7-10: datatable bootstrap,
validator script, build/validate workflow JSON, API import with credentials
- Fix MailPace credential header: X-Server-Token (not MailPace-Server-Token)
- Renumber old Tasks 10-12 → 11-13
- Update self-review notes with data table uncertainty and node naming
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>