Provisioned dashboard for the product owner's weekly check-in: system
health (Prometheus + Loki), user activity (PostgreSQL audit_log), archive
progress (PostgreSQL transcription_blocks + audit_log), and OCR quality
(Prometheus ocr-service metrics). Default range 7d, manual refresh,
thresholds per the issue spec.
Refs #651.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
