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.

cert-manager/k8s/homelab-internal-root-ca.crt

@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+GPGcNIBctjdXhg==
+-----END CERTIFICATE-----

cert-manager/k8s/internal-ca.yaml

@@ -0,0 +1,33 @@
+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: selfsigned
+spec:
+  selfSigned: {}
+---
+# Homelab internal root CA (10y). Install the .crt on clients (see below).
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: internal-ca-root
+  namespace: cert-manager
+spec:
+  isCA: true
+  commonName: homelab internal root CA
+  duration: 87600h
+  renewBefore: 7200h
+  secretName: internal-ca-root
+  privateKey:
+    algorithm: RSA
+    size: 4096
+  issuerRef:
+    name: selfsigned
+    kind: ClusterIssuer
+---
+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: internal-ca
+spec:
+  ca:
+    secretName: internal-ca-root