cheeztv: terminate public cheeztv.unkin.net TLS with the LE *.unkin.net wildcard (#417)

why: cheeztv.unkin.net needs a publicly-trusted cert; DNS-01 via the delegated acme.unkin.net zone is now working (staging wildcard verified end-to-end in ~70s). A single centrally-managed wildcard avoids per-host CNAMEs and LE duplicate-order rate limits.

- add Certificate wildcard-unkin-net (cert-manager ns, ClusterIssuer letsencrypt prod, secret wildcard-unkin-net-tls) with emberstack reflector secretTemplate annotations
- reflect the secret into the cheeztv namespace (append future consumers to the two reflector namespace lists)
- point the public cheeztv gateway listener at wildcard-unkin-net-tls and drop its vault-issuer annotations (cheeztv-internal stays on vault-issuer)

Reviewed-on: #417
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

apps/base/cert-manager/certificate_wildcard-unkin-net.yaml

@@ -0,0 +1,27 @@
+---
+# Single, centrally-managed Let's Encrypt *.unkin.net wildcard. DNS-01 validates
+# once against the delegated _acme-challenge.unkin.net CNAME, so consumers get a
+# real public leaf without per-host challenge records. The minted secret carries
+# emberstack reflector annotations (via secretTemplate) so it is auto-reflected
+# into consumer namespaces; append future consumers to the *-namespaces lists.
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: wildcard-unkin-net
+  namespace: cert-manager
+spec:
+  secretName: wildcard-unkin-net-tls
+  secretTemplate:
+    annotations:
+      reflector.v1.k8s.emberstack.com/reflection-allowed: "true"
+      reflector.v1.k8s.emberstack.com/reflection-allowed-namespaces: "cheeztv"
+      reflector.v1.k8s.emberstack.com/reflection-auto-enabled: "true"
+      reflector.v1.k8s.emberstack.com/reflection-auto-namespaces: "cheeztv"
+  privateKey:
+    size: 4096
+  dnsNames:
+    - "*.unkin.net"
+  issuerRef:
+    name: letsencrypt
+    kind: ClusterIssuer
+    group: cert-manager.io