Add comprehensive Warehouse13 Helm chart with configurable images

Features:
- Complete Helm chart at helm/warehouse13/ with Warehouse13 branding
- Configurable images for all components (PostgreSQL, MinIO, API, Frontend)
- Support for 3 deployment scenarios: dev, production, air-gapped
- 14 Kubernetes templates: Deployments, StatefulSets, Services, Ingress
- Persistent storage with configurable storage classes
- Health checks for all services
- Ingress with TLS support
- Security contexts and RBAC
- Comprehensive documentation:
  - HELM-DEPLOYMENT.md (main Kubernetes guide)
  - helm/warehouse13/README.md (full chart docs)
  - helm/warehouse13/QUICKSTART.md (5-min deployment)
  - Example values files (dev, production, air-gapped)
- Updated main README.md with Helm deployment instructions
- Marked old helm chart as deprecated

All component images fully configurable via values.yaml:
- postgres:15-alpine
- minio/minio:latest
- warehouse13/api:latest
- warehouse13/frontend:latest

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

helm/warehouse13/values-airgapped.yaml

@@ -0,0 +1,99 @@
+# Warehouse13 - Air-Gapped Deployment Example
+# Use this for restricted/disconnected environments
+
+global:
+  deploymentMode: "airgapped"
+  storageBackend: "minio"
+
+# PostgreSQL with custom registry
+postgres:
+  enabled: true
+  image:
+    repository: harbor.internal.example.com/library/postgres
+    tag: 15-alpine
+    pullPolicy: IfNotPresent
+  auth:
+    username: warehouse13user
+    password: CHANGE_ME_SECURE_PASSWORD
+    database: warehouse13
+  persistence:
+    enabled: true
+    size: 20Gi
+    storageClass: "local-storage"
+  resources:
+    requests:
+      memory: "512Mi"
+      cpu: "500m"
+    limits:
+      memory: "1Gi"
+      cpu: "1000m"
+
+# MinIO with custom registry
+minio:
+  enabled: true
+  image:
+    repository: harbor.internal.example.com/library/minio
+    tag: RELEASE.2024-01-01T00-00-00Z
+    pullPolicy: IfNotPresent
+  auth:
+    rootUser: CHANGE_ME_MINIO_USER
+    rootPassword: CHANGE_ME_MINIO_PASSWORD
+  persistence:
+    enabled: true
+    size: 100Gi
+    storageClass: "local-storage"
+  resources:
+    requests:
+      memory: "1Gi"
+      cpu: "500m"
+    limits:
+      memory: "2Gi"
+      cpu: "1000m"
+
+# API with custom registry
+api:
+  enabled: true
+  image:
+    repository: harbor.internal.example.com/warehouse13/api
+    tag: v1.0.0
+    pullPolicy: IfNotPresent
+  replicas: 2
+  resources:
+    requests:
+      memory: "512Mi"
+      cpu: "500m"
+    limits:
+      memory: "1Gi"
+      cpu: "1000m"
+
+# Frontend with custom registry
+frontend:
+  enabled: true
+  image:
+    repository: harbor.internal.example.com/warehouse13/frontend
+    tag: v1.0.0
+    pullPolicy: IfNotPresent
+  replicas: 2
+  resources:
+    requests:
+      memory: "256Mi"
+      cpu: "250m"
+    limits:
+      memory: "512Mi"
+      cpu: "500m"
+
+# Ingress disabled for air-gapped - use NodePort or port-forward
+ingress:
+  enabled: false
+
+# Node selector for specific nodes
+nodeSelector:
+  environment: production
+  storage: local
+
+# Tolerations for tainted nodes
+tolerations:
+  - key: "airgapped"
+    operator: "Equal"
+    value: "true"
+    effect: "NoSchedule"