feat(adminreport): weekly admin report by email — nmg-scheduler sends an HTML summary every configured weekday at 08:00 with 7-day mail flow (total, clean, spam, reject, bounce), top sender domains, current quarantine depth, and disk usage; configurable in Settings → Digest (admin_report_enabled, admin_report_recipients, admin_report_weekday) (migration 0128) (1.50.91)
fix(mailconfig): alert_threshold fields (0126) were missing from both UPDATE statements — values were read and displayed but never persisted; fixed (1.50.91)