Add Pure FlashArray OpenMetrics exporter to monitoring namespace

- Deploy purestorage/pure-fa-om-exporter:v1.0.27 container
- Configure API token secret for utilidor FlashArray (jarvis user)
- Expose /metrics endpoint via ClusterIP service on port 9490
- ServiceMonitor for kube-prometheus-stack auto-discovery
- ArgoCD application for GitOps deployment (wave 3)
- Scrape interval: 60s (storage metrics low frequency)
- Resource limits: 200m CPU / 128Mi memory

Provides pure_* metrics namespace for FlashArray capacity, performance,
volume stats, host connectivity, etc.

cluster/platform/pure-exporter/secret.yaml

@@ -0,0 +1,26 @@
+# ------------------------------------------------------------------------------
+# Pure FlashArray OpenMetrics Exporter - API Token Secret
+#
+# Contains the FlashArray endpoint and API token for the exporter to authenticate
+# 
+# Endpoint: utilidor.local.mk-labs.cloud (10.1.71.5)
+# API User: jarvis (readonly)
+#
+# Note: This is a base64-encoded secret. For production, consider using
+# ExternalSecret with 1Password integration like portworx-csi does.
+# ------------------------------------------------------------------------------
+apiVersion: v1
+kind: Secret
+metadata:
+  name: pure-fa-exporter-token
+  namespace: monitoring
+  labels:
+    app.kubernetes.io/name: pure-fa-exporter
+    app.kubernetes.io/component: metrics
+type: Opaque
+stringData:
+  # tokens.yaml format for the exporter
+  tokens.yaml: |
+    utilidor:
+      address: utilidor.local.mk-labs.cloud
+      api_token: 6157dea0-4c0d-b14b-6e6a-453aa649355d