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/postgres-deployment.yaml

@@ -0,0 +1,47 @@
+# ------------------------------------------------------------------------------
+# Deployment: PostgreSQL (nuq-postgres)
+# Database for Firecrawl job queue and state management
+# ------------------------------------------------------------------------------
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: firecrawl-postgres
+  namespace: firecrawl
+  labels:
+    app: firecrawl-postgres
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: firecrawl-postgres
+  template:
+    metadata:
+      labels:
+        app: firecrawl-postgres
+    spec:
+      containers:
+        - name: postgres
+          image: ghcr.io/mendableai/firecrawl/nuq-postgres:latest
+          env:
+            - name: POSTGRES_USER
+              value: "postgres"
+            - name: POSTGRES_PASSWORD
+              value: "postgres"
+            - name: POSTGRES_DB
+              value: "postgres"
+          ports:
+            - containerPort: 5432
+              name: postgres
+          resources:
+            requests:
+              memory: "512Mi"
+              cpu: "250m"
+            limits:
+              memory: "1Gi"
+              cpu: "500m"
+          volumeMounts:
+            - name: postgres-data
+              mountPath: /var/lib/postgresql/data
+      volumes:
+        - name: postgres-data
+          emptyDir: {}  # For now, ephemeral storage. TODO: Add PVC for persistence