fix: serve a leaf certificate, not the CA

LibreChat served the lab CA's own certificate as its server certificate — a
CA:TRUE certificate valid for the whole *.sttlab.local wildcard, from a
hand-made tls.yaml that also carried the CA's private key. Gitignored, so never
leaked, but the only service in the estate still copying the CA around instead
of being issued a leaf.

Now a cert-manager Certificate for librechat.sttlab.local: CA:FALSE, one
dnsNames, key generated in the cluster and rotated there.

The two uses of that Secret had to be separated first, which is the part worth
knowing: sttlab-tls was both the ingress certificate and the CA bundle mounted
as NODE_EXTRA_CA_CERTS for outbound calls. Replacing it with a leaf alone would
have left LibreChat unable to verify Keycloak. The CA certificate now comes from
ca-configmap.yaml — the certificate, never the key, committed like the agents'.

Verified: the ingress serves CA:FALSE with SAN librechat.sttlab.local, the pod's
outbound call to Keycloak returns 200 with TLS verified, and the old secret is
deleted.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

k8s/ca-configmap.yaml

@@ -0,0 +1,38 @@
+# The lab CA, so LibreChat can verify keycloak.sttlab.local and the domain
+# gateways rather than disabling verification.
+#
+# The certificate, never the key — which is the whole difference from the
+# `ingress/tls.yaml` this replaces. A CA certificate is public by construction, so it is
+# committed and the deployment has no hidden prerequisite.
+#
+# Issued by the sttlab-local-ca ClusterIssuer, valid until 2026-11-24.
+# Regenerate on rotation:
+#   kubectl -n cert-manager get secret sttlab-local-ca \
+#     -o jsonpath='{.data.tls\.crt}' | base64 -d
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: sttlab-ca
+  namespace: librechat
+data:
+  ca.crt: |
+    -----BEGIN CERTIFICATE-----
+    MIIDPDCCAiSgAwIBAgIUd/utDf+f0yQR3v3qTjZqx+wvTZMwDQYJKoZIhvcNAQEL
+    BQAwGTEXMBUGA1UEAwwOKi5zdHRsYWIubG9jYWwwHhcNMjUxMTI0MTUzODQ1WhcN
+    MjYxMTI0MTUzODQ1WjAZMRcwFQYDVQQDDA4qLnN0dGxhYi5sb2NhbDCCASIwDQYJ
+    KoZIhvcNAQEBBQADggEPADCCAQoCggEBALj0sryq8qXtkShT/B+/EjVJNN/TLHIn
+    QJYc6xuUH/f7q3dYdLm4iH0XnFgrSQLUo4iqd/Mczef5iWCYwT5FFa7P17/TcLVf
+    gso0j41qNLBjGxDQGQ6Z1VCxi6oan8ow98rumjVj0E0Qgs5CX/rN+gcEmZ/TZFWU
+    qudVoztpeiVqJ0dxCIq+KMutzd1BU7BXx4VRO9Y+t1idUc7oY7BPmS2qPAN7TtXP
+    j1KhH2BgLsmF5GRhYHNS578eCltcmS2sbQ3c7GwOV96lpgF9TixEvFXeN4xk43E6
+    1COUD7CRiWAZ0XI8FMlpZGeNZeV4bbV/MqVig1ybWNOz9MDKYj3eoXUCAwEAAaN8
+    MHowHQYDVR0OBBYEFDbzYWOPr4vxa+VONs7xHbcNx70YMB8GA1UdIwQYMBaAFDbz
+    YWOPr4vxa+VONs7xHbcNx70YMA8GA1UdEwEB/wQFMAMBAf8wJwYDVR0RBCAwHoIO
+    Ki5zdHRsYWIubG9jYWyCDHN0dGxhYi5sb2NhbDANBgkqhkiG9w0BAQsFAAOCAQEA
+    tU4p5/ONXm7x4YDzSeL8NdThVLguiFur0jcTxvvPUS4NFNsnQJk4OXxBgjy1YwpL
+    3i56/4mCEd9OCQF/Hl0eFwGZBzNKlMoTA08AC/lBDvPrnVjuUu0qe/b/2KOkhESa
+    x8rQNp0o8pcj0f29nu0JfRqYGkzy0Lh2qgXhPu2iC+t2PfdleRAky1tt68wogdFL
+    TvHDsJbVo/ihsPpONlSyHfxG6bb/0Mkz64PH46TTt9GvJflEKMqDwivNFUA1P5S/
+    U4Ic8Qapnxc7h2+WbRjmYrnuygC2wMBE6rL9OF3gwCr1fkgGGRr5lVRUq2X2HZV5
+    5jqViv6eurq8O61N3vWGCQ==
+    -----END CERTIFICATE-----