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/QUICKSTART.md

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+# Warehouse13 Helm Chart - Quick Start
+
+## 5-Minute Deployment
+
+### Prerequisites Check
+
+```bash
+# Verify Kubernetes cluster access
+kubectl cluster-info
+
+# Verify Helm is installed
+helm version
+
+# Create namespace
+kubectl create namespace warehouse13
+```
+
+### Deploy with Defaults
+
+```bash
+# Install chart
+helm install warehouse13 ./helm/warehouse13 --namespace warehouse13
+
+# Wait for ready
+kubectl wait --for=condition=ready pod --all -n warehouse13 --timeout=5m
+```
+
+### Access Application
+
+```bash
+# In separate terminals, run:
+
+# Terminal 1: Frontend
+kubectl port-forward -n warehouse13 svc/warehouse13-frontend 4200:80
+
+# Terminal 2: API
+kubectl port-forward -n warehouse13 svc/warehouse13-api 8000:8000
+
+# Terminal 3: MinIO Console
+kubectl port-forward -n warehouse13 svc/warehouse13-minio 9001:9001
+```
+
+Then open in browser:
+- **Frontend:** http://localhost:4200
+- **API Docs:** http://localhost:8000/docs
+- **MinIO Console:** http://localhost:9001
+  - Username: `minioadmin`
+  - Password: `minioadmin`
+
+## Common Scenarios
+
+### 1. Development (No Persistence)
+
+```bash
+helm install warehouse13 ./helm/warehouse13 \
+  --namespace warehouse13 \
+  --values ./helm/warehouse13/values-dev.yaml
+```
+
+### 2. Production (With Ingress)
+
+```bash
+# Update values-production.yaml with your settings first
+helm install warehouse13 ./helm/warehouse13 \
+  --namespace warehouse13 \
+  --values ./helm/warehouse13/values-production.yaml
+```
+
+### 3. Air-Gapped (Custom Registry)
+
+```bash
+# Update values-airgapped.yaml with your registry first
+helm install warehouse13 ./helm/warehouse13 \
+  --namespace warehouse13 \
+  --values ./helm/warehouse13/values-airgapped.yaml
+```
+
+### 4. Custom Image Repository
+
+```bash
+helm install warehouse13 ./helm/warehouse13 \
+  --namespace warehouse13 \
+  --set postgres.image.repository=myregistry.com/postgres \
+  --set minio.image.repository=myregistry.com/minio \
+  --set api.image.repository=myregistry.com/warehouse13-api \
+  --set frontend.image.repository=myregistry.com/warehouse13-frontend
+```
+
+## Verify Deployment
+
+```bash
+# Check pods
+kubectl get pods -n warehouse13
+
+# Check services
+kubectl get svc -n warehouse13
+
+# View logs
+kubectl logs -n warehouse13 -l app.kubernetes.io/component=api --tail=50
+
+# Check resource usage
+kubectl top pods -n warehouse13
+```
+
+## Cleanup
+
+```bash
+# Uninstall release
+helm uninstall warehouse13 -n warehouse13
+
+# Delete PVCs (data will be lost!)
+kubectl delete pvc -n warehouse13 --all
+
+# Delete namespace
+kubectl delete namespace warehouse13
+```
+
+## Next Steps
+
+- **Full Documentation:** [README.md](./README.md)
+- **Deployment Guide:** [../../HELM-DEPLOYMENT.md](../../HELM-DEPLOYMENT.md)
+- **Configuration Options:** [values.yaml](./values.yaml)
+- **Example Configs:** [values-dev.yaml](./values-dev.yaml), [values-production.yaml](./values-production.yaml), [values-airgapped.yaml](./values-airgapped.yaml)
+
+## Troubleshooting
+
+### Pods stuck in Pending
+```bash
+kubectl describe pod <pod-name> -n warehouse13
+# Check: PVC status, node resources, storage classes
+```
+
+### Image pull errors
+```bash
+kubectl describe pod <pod-name> -n warehouse13
+# Check: Image repository, credentials, network access
+```
+
+### Database connection errors
+```bash
+kubectl logs -n warehouse13 warehouse13-postgres-0
+kubectl get secret -n warehouse13 warehouse13-secrets -o yaml
+```
+
+## Support
+
+- GitHub Issues: https://github.com/yourusername/warehouse13/issues
+- Documentation: https://warehouse13.example.com/docs