feat: Add stack.toml metadata files for Komodo recognition

Added stack.toml files for all stacks:
- monitoring/prometheus/stack.toml
- monitoring/grafana/stack.toml
- monitoring/node-exporter/stack.toml
- communication/gotify/stack.toml
- communication/vaultwarden/stack.toml

Each stack.toml contains:
- Stack metadata (name, description, version, category)
- Compose file reference
- Secret variables
- Port mappings
- Volume definitions
- Network configuration
- Healthcheck settings

stacks/monitoring/grafana/stack.toml

@@ -0,0 +1,30 @@
+[stack]
+name = "Grafana"
+description = "Grafana Dashboards & Visualisierung"
+version = "1.0.0"
+category = "monitoring"
+
+[compose]
+file = "compose.yml"
+
+[variables.secrets]
+grafana-admin-user = "Admin Username"
+grafana-admin-pass = "Admin Password"
+
+[ports]
+internal = 3000
+external = "127.0.0.1:3000"
+description = "Grafana Web UI"
+
+[volumes]
+grafana_data = "/var/lib/grafana"
+grafana_config = "/etc/grafana"
+
+[networks]
+monitoring = "bridge"
+
+[healthcheck]
+endpoint = "http://localhost:3000/api/health"
+interval = "30s"
+timeout = "10s"
+retries = 3

stacks/monitoring/node-exporter/stack.toml

@@ -0,0 +1,25 @@
+[stack]
+name = "Node Exporter"
+description = "System-Metriken für Prometheus"
+version = "1.0.0"
+category = "monitoring"
+
+[compose]
+file = "compose.yml"
+
+[variables]
+# Keine Secrets erforderlich
+
+[ports]
+internal = 9100
+external = "127.0.0.1:9100"
+description = "Node Exporter Metrics"
+
+[networks]
+monitoring = "bridge"
+
+[healthcheck]
+endpoint = "http://localhost:9100/metrics"
+interval = "30s"
+timeout = "10s"
+retries = 3

stacks/monitoring/prometheus/stack.toml

@@ -0,0 +1,29 @@
+[stack]
+name = "Prometheus"
+description = "Prometheus Monitoring & Alerting System"
+version = "1.0.0"
+category = "monitoring"
+
+[compose]
+file = "compose.yml"
+
+[variables]
+# Keine Secrets erforderlich für Basis-Installation
+
+[ports]
+internal = 9090
+external = "127.0.0.1:9090"
+description = "Prometheus Web UI"
+
+[volumes]
+prometheus_data = "/prometheus"
+prometheus_config = "/etc/prometheus"
+
+[networks]
+monitoring = "bridge"
+
+[healthcheck]
+endpoint = "http://localhost:9090/-/healthy"
+interval = "30s"
+timeout = "10s"
+retries = 3