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/secrets-prod-frostmoln.yaml

@@ -0,0 +1,21 @@
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: geo-service
+spec:
+  refreshInterval: 1h
+  # The namespace's store (infra frostmoln/production/apps.tf); MAPS_API_KEY
+  # lives in the Frostmoln Secret "dancefinder", next to the API's settings
+  # (infra frostmoln/production/scripts/seed-app.sh).
+  secretStoreRef:
+    name: frostmoln
+    kind: SecretStore
+  target:
+    name: geo-service
+    template:
+      engineVersion: v2
+      data:
+        MAPS_API_KEY: "{{ .MAPS_API_KEY }}"
+  dataFrom:
+  - extract:
+      key: dancefinder