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/worker-deployment.yaml

@@ -0,0 +1,44 @@
+# ------------------------------------------------------------------------------
+# Deployment: Firecrawl Worker
+# Background worker for processing crawl jobs
+# ------------------------------------------------------------------------------
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: firecrawl-worker
+  namespace: firecrawl
+  labels:
+    app: firecrawl-worker
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: firecrawl-worker
+  template:
+    metadata:
+      labels:
+        app: firecrawl-worker
+    spec:
+      terminationGracePeriodSeconds: 180
+      containers:
+        - name: worker
+          image: ghcr.io/mendableai/firecrawl:latest
+          command: ["node"]
+          args: ["--max-old-space-size=4096", "dist/src/services/queue-worker.js"]
+          envFrom:
+            - configMapRef:
+                name: firecrawl-config
+          env:
+            - name: FLY_PROCESS_GROUP
+              value: "worker"
+            - name: NUQ_POD_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
+          resources:
+            requests:
+              memory: "3Gi"
+              cpu: "1000m"
+            limits:
+              memory: "4Gi"
+              cpu: "1000m"