refactor(firecrawl): Convert to production-ready Helm chart with persistent storage

CRITICAL FIXES:
✅ Add PersistentVolumeClaims for all stateful services
   - PostgreSQL: 20Gi PVC on nfs-emporium (data persistence)
   - Redis: 10Gi PVC on nfs-emporium (cache and queue)
   - RabbitMQ: 5Gi PVC on nfs-emporium (message queue)

✅ Pin all image versions (no more 'latest' tags)
   - Firecrawl API/Worker: v1.0.0
   - Playwright Service: v1.0.0
   - PostgreSQL (nuq-postgres): v1.0.0
   - Redis: 7.4.1-alpine
   - RabbitMQ: 3.13.7-management-alpine

✅ Convert raw manifests to proper Helm chart
   - Template-based configuration
   - Centralized values.yaml
   - Proper Helm helpers and labels
   - Easy configuration management

WHAT CHANGED:
- Created chart/ directory with full Helm chart structure
- Moved old manifests to old-manifests/ for reference
- Updated ArgoCD Application to use Helm chart source
- Added comprehensive README and MIGRATION docs
- All services now use nfs-emporium storage class
- Redis configured with AOF persistence
- Proper resource limits and health checks
- Gateway/HTTPRoute configs integrated into chart

DEPLOYMENT:
ArgoCD will automatically sync and apply changes.
Old ephemeral data will be lost (fresh start with persistence).

Resolves data loss issues and brings deployment to production standards.

cluster/applications/firecrawl/old-manifests/rabbitmq-service.yaml

@@ -0,0 +1,21 @@
+# ------------------------------------------------------------------------------
+# Service: RabbitMQ
+# ------------------------------------------------------------------------------
+apiVersion: v1
+kind: Service
+metadata:
+  name: firecrawl-rabbitmq
+  namespace: firecrawl
+spec:
+  type: ClusterIP
+  selector:
+    app: firecrawl-rabbitmq
+  ports:
+    - protocol: TCP
+      port: 5672
+      targetPort: 5672
+      name: amqp
+    - protocol: TCP
+      port: 15672
+      targetPort: 15672
+      name: management