feat: deploy to Frostmoln production

Replace the AWS deploy-prod job (failing since CI left AWS) with deploy-prod-frostmoln, and run under the restricted Pod Security profile with the namespace's oci-registry pull secret.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H6eVuR4Yt3m7TbDTDwyZJi

k8s/autoscale-prod-frostmoln.yaml

@@ -0,0 +1,20 @@
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  labels:
+    app.kubernetes.io/name: dancefinder-app
+  name: dancefinder-app
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: dancefinder-app
+  minReplicas: 2
+  maxReplicas: 4
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: 60