docs: update PROJECT_STATUS.md and CLAUDE.md with monitoring dashboard

- Mark Monitoring & Alerting Dashboard as completed in roadmap
- Add monitoring subsystem to CLAUDE.md subsystems table
- Add 4 monitoring collections to collections list (55+ → 59+)
- Add monitoring dashboard URL
- Add changelog entry for 15.02.2026

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -196,6 +196,7 @@ Deutsch (default) + Englisch. API: `?locale=de|en`. DB: `_locales` Tabellen.
 | API | https://pl.porwoll.tech/api |
 | Swagger UI | https://pl.porwoll.tech/api/docs |
 | Production | https://cms.c2sgmbh.de |
+| Monitoring Dashboard | https://pl.porwoll.tech/admin/monitoring |
 
 → Vollständige Endpoint-Liste: `docs/anleitungen/API_ANLEITUNG.md`
 
@@ -222,8 +223,9 @@ Deutsch (default) + Englisch. API: `?locale=de|en`. DB: `_locales` Tabellen.
 | Community Management | `src/lib/integrations/meta/`, `src/lib/jobs/` | `docs/CLAUDE_REFERENCE.md` |
 | YouTube Operations Hub | `src/lib/youtube/`, API: `/api/youtube/*` | `docs/CLAUDE_REFERENCE.md` |
 | FormSubmissions CRM | `src/collections/FormSubmissionsOverrides.ts` | `docs/CLAUDE_REFERENCE.md` |
+| Monitoring & Alerting | `src/lib/monitoring/`, API: `/api/monitoring/*` | `docs/CLAUDE_REFERENCE.md` |
 
-## Collections (55+)
+## Collections (59+)
 
 | Slug | Beschreibung | Gruppe |
 |------|--------------|--------|
@@ -286,6 +288,10 @@ Deutsch (default) + Englisch. API: `?locale=de|en`. DB: `_locales` Tabellen.
 | site-settings | Website-Einstellungen (pro Tenant) | System |
 | navigations | Navigationsmenüs (pro Tenant) | System |
 | redirects | URL-Weiterleitungen (Plugin) | System |
+| monitoring-snapshots | Historische System-Metriken | Monitoring |
+| monitoring-logs | Structured Business-Logs | Monitoring |
+| monitoring-alert-rules | Konfigurierbare Alert-Regeln | Monitoring |
+| monitoring-alert-history | Alert-Log (WORM) | Monitoring |
 
 ## Blocks (43)
 

docs/PROJECT_STATUS.md

@@ -1,6 +1,6 @@
 # Projekt Status - Februar 2026
 
-**Stand:** 14. Februar 2026
+**Stand:** 15. Februar 2026
 
 ## Zusammenfassung
 
@@ -87,6 +87,31 @@ Die komplette Entwicklungsinfrastruktur ist eingerichtet und funktionsfähig:
   - Konfigurierbare Report-Settings
   - Cron-basierter Versand
 
+### Monitoring & Alerting Dashboard
+
+- [x] **System-Überwachung:**
+  - CPU, RAM, Disk-Auslastung (Node.js os-Modul)
+  - PM2 Prozess-Status (Payload + Queue-Worker)
+  - Load Average, Uptime
+- [x] **Service-Status:**
+  - PostgreSQL, PgBouncer, Redis, SMTP, OAuth-Tokens, BullMQ Queues, Cron-Jobs
+- [x] **Performance-Tracking:**
+  - Response-Zeiten (Avg, P95, P99), Error-Rate, Requests/Minute
+  - In-Memory Ring-Buffer (10.000 Einträge)
+- [x] **Alerting:**
+  - Konfigurierbare Regeln (MonitoringAlertRules Collection)
+  - Multi-Channel: Email, Slack, Discord
+  - Cooldown-basierte Deduplizierung
+- [x] **Structured Logging:**
+  - MonitoringLogs Collection mit Level/Source-Filter
+  - Fire-and-forget Logger mit Payload-Fallback
+- [x] **Dashboard UI:**
+  - 5-Tab-Dashboard unter /admin/monitoring
+  - SSE-basierte Echtzeit-Updates
+  - Trend-Charts, Gauge-Widgets, Service-Karten
+- [x] **Data Retention:**
+  - Snapshots: 7 Tage, Logs: 30 Tage, Alert-History: 90 Tage
+
 ### sv-frontend (Multi-Project)
 
 - [x] Node.js 22.x + pnpm
@@ -122,6 +147,7 @@ Organisation: **complexcaresolutions** (Internal)
 |-----------|---------|--------|
 | ✅ | Meta (Facebook/Instagram) Kommentar-Sync | Erledigt |
 | ✅ | YouTube Thumbnail-Download für Offline-Anzeige | Erledigt |
+| ✅ | Monitoring & Alerting Dashboard | Erledigt |
 
 ---
 
@@ -144,7 +170,7 @@ Organisation: **complexcaresolutions** (Internal)
 7. [ ] Alle 9 Frontends entwickeln
 8. [ ] Migration von Plesk-Domains zu neuer Infra
 9. [ ] AI-gestützte Kommentar-Moderation
-10. [ ] Monitoring & Alerting Dashboard
+10. [x] ~~Monitoring & Alerting Dashboard~~
 
 ---
 
@@ -205,6 +231,16 @@ pm2 logs payload
 
 ## 📝 Änderungsprotokoll
 
+### 15.02.2026
+- **Monitoring & Alerting Dashboard implementiert:**
+  - 4 neue Collections: MonitoringSnapshots, MonitoringLogs, MonitoringAlertRules, MonitoringAlertHistory
+  - Backend-Services: MonitoringService, PerformanceTracker, MonitoringLogger, AlertEvaluator, SnapshotCollector
+  - 8 REST-Endpoints unter /api/monitoring/* + SSE-Stream
+  - 5-Tab Admin Dashboard (System Health, Services, Performance, Alerts, Logs)
+  - Data Retention Policies (7d/30d/90d)
+  - 31 Tests für Monitoring-Module (Types, Service, Tracker, Logger, Evaluator)
+  - Feature-Branch: feature/monitoring-dashboard
+
 ### 14.02.2026
 - **YouTube Thumbnail-Download implementiert:**
   - `downloadAndUploadImage()` Utility für Bild-Download → Payload Media