feat(PROJ-40,PROJ-41): Prometheus Metriken + Dashboard Zeitreihe
- PROJ-40: /api/health mit Version+Uptime, /metrics Prometheus-Format
(mails_last_60min/24h/7d/30d, mails_total, storage_bytes, tenants_total,
users_total, uptime_seconds) — Token-Schutz optional konfigurierbar
- PROJ-41: GET /api/admin/stats/timeseries (30-Tage tagesgenau, Tenant-scoped)
+ SVG-Balkendiagramm im Dashboard (Mail-Eingang letzte 30 Tage)
- storage.DBQueryRow() Helper für Metrics-Queries ohne Pool-Exposition
- config.MetricsConfig (enabled, token) in config.go
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
sysops
9298216ce0