chore: move local dev to shiny(-api).local.unbound.se

staging-shiny(-api).unbound.se belonged to the retired AWS staging.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ma8eHhW59hLAJuLzBnLvUu

k8s/app/certificates.yaml

@@ -29,8 +29,8 @@ spec:
   dnsNames:
   - shiny
   - auth0
-  - staging-shiny.unbound.se
-  - staging-shiny-api.unbound.se
+  - shiny.local.unbound.se
+  - shiny-api.local.unbound.se
   secretName: self-signed-cert-tls
   issuerRef:
     name: self-signed