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/ingress-prod-frostmoln.yaml

@@ -0,0 +1,20 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: dancefinder-app
+  annotations:
+    traefik.ingress.kubernetes.io/router.entrypoints: websecure
+    traefik.ingress.kubernetes.io/router.tls.certresolver: letsencrypt
+spec:
+  ingressClassName: traefik
+  rules:
+  - host: "dancefinder.unbound.se"
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: dancefinder-app
+            port:
+              number: 80