feat: add longhorn storage and documentation

infrastructure/longhorn/Chart.yaml

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+apiVersion: v2
+name: longhorn-bootstrap
+description: Wrapper chart for Longhorn
+type: application
+version: 1.0.0
+appVersion: "1.0.0"
+dependencies:
+  - name: longhorn
+    version: 1.6.0 # Nutze eine stabile Version
+    repository: https://charts.longhorn.io

infrastructure/longhorn/values.yaml

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+longhorn:
+  persistence:
+    defaultClass: true
+    defaultClassReplicaCount: 3
+  
+  defaultSettings:
+    createDefaultDiskLabeledNodes: true
+    defaultDataPath: /var/lib/longhorn
+    # Backup Target (für später mit SeaweedFS)
+    # backupTarget: s3://longhorn-backups@us-east-1/
+    # backupTargetCredentialSecret: longhorn-backup-secret
+  
+  ingress:
+    enabled: true
+    ingressClassName: traefik
+    host: longhorn.stabify.de
+    annotations:
+      cert-manager.io/cluster-issuer: letsencrypt-production
+    tls: true
+    tlsSecret: longhorn-tls