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/README.md

@@ -0,0 +1,46 @@
+# Helm Charts
+
+This directory contains Helm charts for deploying Warehouse13.
+
+## Current Chart (Recommended)
+
+**Location:** `./warehouse13/`
+
+The latest, fully-featured Helm chart with:
+- Warehouse13 branding
+- Configurable images for all components
+- Multiple deployment scenarios (dev, production, air-gapped)
+- Comprehensive documentation
+- Example values files
+
+**Usage:**
+```bash
+helm install warehouse13 ./warehouse13
+```
+
+**Documentation:** See [warehouse13/README.md](./warehouse13/README.md)
+
+## Legacy Chart (Deprecated)
+
+The files in this root `helm/` directory are from an older version and are marked as deprecated. Please use the `./warehouse13/` chart instead.
+
+## Migration
+
+If you're using the old chart, migration is straightforward:
+
+```bash
+# Uninstall old chart
+helm uninstall datalake
+
+# Install new chart
+helm install warehouse13 ./warehouse13
+
+# Or upgrade in place (if compatible)
+helm upgrade datalake ./warehouse13
+```
+
+Note: Check your values.yaml configuration and update image repositories, resource limits, and other settings as needed.
+
+## Quick Start
+
+See [../HELM-DEPLOYMENT.md](../HELM-DEPLOYMENT.md) for comprehensive deployment guide.