feat: Initial stacks for testing

Added first test stacks:
- monitoring/prometheus
- monitoring/grafana
- monitoring/node-exporter
- communication/gotify
- communication/vaultwarden

All stacks:
- Use localhost ports only (for Caddy reverse proxy)
- Support Komodo Secrets via ${SECRET:secret-name}
- Include README with Caddy integration instructions
- Ready for Komodo v2 Resource Sync

stacks/monitoring/grafana/README.md

@@ -0,0 +1,74 @@
+# Grafana
+
+📊 **Dashboards & Visualisierung**
+
+Grafana ist eine Open-Source-Plattform für Datenvisualisierung.
+
+---
+
+## 🚀 Quick Start
+
+1. **In Komodo:** Stack auswählen → Deploy
+2. **Server wählen**
+3. **Warten** bis Container läuft
+4. **Caddy Config** hinzufügen
+5. **Öffnen** und einloggen (admin/admin)
+
+---
+
+## 🔧 Caddy Integration
+
+```bash
+ssh <server>
+sudo nano /etc/caddy/Caddyfile
+```
+
+Hinzufügen:
+```caddyfile
+grafana.example.com {
+    reverse_proxy localhost:3000
+}
+```
+
+```bash
+sudo systemctl reload caddy
+```
+
+---
+
+## 🔐 Secrets (Komodo)
+
+| Secret Name | Beschreibung | Beispiel |
+|-------------|--------------|----------|
+| `grafana-admin-user` | Admin Username | `admin` |
+| `grafana-admin-pass` | Admin Password | `sicheres-passwort` |
+
+---
+
+## 📁 Files
+
+- `compose.yml` - Docker Compose Konfiguration
+
+---
+
+## 📊 Datenquellen
+
+Nach dem ersten Login:
+1. **Configuration → Data Sources**
+2. **Add data source**
+3. **Prometheus** auswählen
+4. URL: `http://prometheus:9090` (wenn auf gleichem Server: `http://localhost:9090`)
+5. **Save & Test**
+
+---
+
+## 🔄 Updates
+
+Wird automatisch aktuell gehalten durch Komodo.
+
+---
+
+## 📞 Support
+
+- **Docs:** https://grafana.com/docs
+- **GitHub:** https://github.com/grafana/grafana

stacks/monitoring/grafana/compose.yml

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+services:
+  grafana:
+    image: grafana/grafana:latest
+    container_name: grafana
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:3000:3000"
+    volumes:
+      - grafana_data:/var/lib/grafana
+      - grafana_config:/etc/grafana
+    environment:
+      - GF_SECURITY_ADMIN_USER=${SECRET:grafana-admin-user}
+      - GF_SECURITY_ADMIN_PASSWORD=${SECRET:grafana-admin-pass}
+      - GF_USERS_ALLOW_SIGN_UP=false
+    networks:
+      - monitoring
+    healthcheck:
+      test: ["CMD-SHELL", "wget --spider -q http://localhost:3000/api/health || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+volumes:
+  grafana_data:
+  grafana_config:
+
+networks:
+  monitoring:
+    driver: bridge

stacks/monitoring/node-exporter/README.md

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+# Node Exporter
+
+📈 **System-Metriken für Prometheus**
+
+Node Exporter sammelt Hardware- und Betriebssystem-Metriken.
+
+---
+
+## 🚀 Quick Start
+
+1. **In Komodo:** Stack auswählen → Deploy
+2. **Server wählen** (wo Prometheus läuft)
+3. **Warten** bis Container läuft
+4. **In Prometheus** als Target hinzufügen
+
+---
+
+## 🔧 Prometheus Integration
+
+In Prometheus Config (`prometheus.yml`):
+
+```yaml
+scrape_configs:
+  - job_name: 'node-exporter'
+    static_configs:
+      - targets: ['localhost:9100']
+```
+
+---
+
+## 🔐 Secrets
+
+Keine Secrets erforderlich.
+
+---
+
+## 📁 Files
+
+- `compose.yml` - Docker Compose Konfiguration
+
+---
+
+## 📊 Metriken
+
+Node Exporter exposed Metriken auf Port 9100:
+- CPU Usage
+- Memory Usage
+- Disk I/O
+- Network I/O
+- System Load
+
+---
+
+## 🔄 Updates
+
+Wird automatisch aktuell gehalten durch Komodo.
+
+---
+
+## 📞 Support
+
+- **GitHub:** https://github.com/prometheus/node_exporter
+- **Docs:** https://prometheus.io/docs/guides/node-exporter/

stacks/monitoring/node-exporter/compose.yml

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+services:
+  node-exporter:
+    image: prom/node-exporter:latest
+    container_name: node-exporter
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:9100:9100"
+    volumes:
+      - /proc:/host/proc:ro
+      - /sys:/host/sys:ro
+      - /:/rootfs:ro
+    command:
+      - '--path.procfs=/host/proc'
+      - '--path.sysfs=/host/sys'
+      - '--path.rootfs=/rootfs'
+      - '--collector.filesystem.mount-points-exclude=^/(sys|proc|dev|host|etc)($$|/)'
+    networks:
+      - monitoring
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "-q", "http://localhost:9100/metrics"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+networks:
+  monitoring:
+    driver: bridge

stacks/monitoring/prometheus/README.md

@@ -0,0 +1,69 @@
+# Prometheus
+
+📊 **Monitoring & Alerting**
+
+Prometheus ist ein Open-Source-Monitoring- und Alerting-System.
+
+---
+
+## 🚀 Quick Start
+
+1. **In Komodo:** Stack auswählen → Deploy
+2. **Server wählen**
+3. **Warten** bis Container läuft
+4. **Caddy Config** hinzufügen
+5. **Öffnen** unter `prometheus.example.com`
+
+---
+
+## 🔧 Caddy Integration
+
+```bash
+ssh <server>
+sudo nano /etc/caddy/Caddyfile
+```
+
+Hinzufügen:
+```caddyfile
+prometheus.example.com {
+    reverse_proxy localhost:9090
+}
+```
+
+```bash
+sudo systemctl reload caddy
+```
+
+---
+
+## 🔐 Secrets (Komodo)
+
+Keine Secrets erforderlich für Basis-Installation.
+
+---
+
+## 📁 Files
+
+- `compose.yml` - Docker Compose Konfiguration
+
+---
+
+## 📊 Prometheus UI
+
+- **URL:** http://localhost:9090
+- **Query Browser:** `/graph`
+- **Alerts:** `/alerts`
+- **Targets:** `/targets`
+
+---
+
+## 🔄 Updates
+
+Prometheus wird automatisch aktuell gehalten durch Komodo.
+
+---
+
+## 📞 Support
+
+- **Docs:** https://prometheus.io/docs
+- **GitHub:** https://github.com/prometheus/prometheus

stacks/monitoring/prometheus/compose.yml

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+services:
+  prometheus:
+    image: prom/prometheus:latest
+    container_name: prometheus
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:9090:9090"
+    volumes:
+      - prometheus_data:/prometheus
+      - prometheus_config:/etc/prometheus
+    command:
+      - '--config.file=/etc/prometheus/prometheus.yml'
+      - '--storage.tsdb.path=/prometheus'
+      - '--storage.tsdb.retention.time=15d'
+      - '--web.console.libraries=/etc/prometheus/console_libraries'
+      - '--web.console.templates=/etc/prometheus/consoles'
+    networks:
+      - monitoring
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "-q", "http://localhost:9090/-/healthy"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+volumes:
+  prometheus_data:
+  prometheus_config:
+
+networks:
+  monitoring:
+    driver: bridge