feat(tls): internal CA wildcard for *.internal routes

Selfsigned root (10y) + internal-ca issuer; per-namespace
internal-wildcard-tls certs referenced by all -local routers.
Root public cert committed for client trust stores.

adguardhome/k8s/internal-certificate.yaml

@@ -0,0 +1,15 @@
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: internal-wildcard-tls
+  namespace: adguard
+spec:
+  secretName: internal-wildcard-tls
+  dnsNames:
+    - "*.workstation.internal"
+    - "*.gigaforust.internal"
+    - workstation.internal
+    - gigaforust.internal
+  issuerRef:
+    name: internal-ca
+    kind: ClusterIssuer