cheeztv: manage the LE *.unkin.net wildcard centrally, reflect into cheeztv

Per review, the *.unkin.net Let's Encrypt wildcard is no longer minted
per-namespace. A single Certificate (wildcard-unkin-net) now lives in the
cert-manager namespace and carries emberstack reflector source annotations via
spec.secretTemplate.annotations, so its secret (wildcard-unkin-net-tls) is
auto-reflected into consumer namespaces. Future consumers are added by
appending to the comma-separated reflection-*-namespaces lists.

Drop apps/base/cheeztv/certificate.yaml and its kustomization entry, and point
the public cheeztv gateway https listener at the reflected wildcard-unkin-net-tls
secret. cheeztv-internal keeps its Vault PKI leaf.

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

apps/base/cert-manager/kustomization.yaml

@@ -11,3 +11,4 @@ resources:
   - vmservicescrape.yaml
   - clusterissuer_letsencrypt.yaml
   - clusterissuer_letsencrypt-staging.yaml
+  - certificate_wildcard-unkin-net.yaml