feat(renovate): track the Keycloak operator (the real Keycloak version), never auto-merge it

The Keycloak CR has no spec.image, so the operator's RELATED_IMAGE_KEYCLOAK picks the
server image; the three keycloak-k8s-resources release URLs in
platform/keycloak/kustomization.yaml are therefore THE Keycloak version, and Renovate
could not see them (no `# renovate:` marker). They now carry markers under one depName
(one branch, groupName keycloak-operator), with a packageRule: automerge false, labels
needs-review + blast-radius; majors still wait on the dashboard.

The untagged quay.io/keycloak/keycloak in catalog/keycloak.yaml renders
apps/wave-1/keycloak.yaml, which no kustomization lists. It is pinned to the operator's
26.0.6 as documentation, re-rendered, and Renovate is disabled for that image so it
cannot raise PRs against a file nothing deploys. The render is kept (not deleted): it is
the fixture for apps/wave-1/tests/app-slis.test.yaml's keycloak SLI rule tests.

README: an "Upgrading Keycloak" section — an operator bump must be checked against
passkey-reconciler.yaml's 26.0.6 Admin API assumptions.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

catalog/keycloak.yaml

@@ -5,8 +5,15 @@
 # Validates against schemas/servicedefinition.schema.json.
 name: keycloak
 kind: container
+# DOCUMENTATION-ONLY IMAGE. The running server is NOT chosen here: the Keycloak operator
+# (platform/keycloak/kustomization.yaml, three pinned release URLs) picks it via its
+# RELATED_IMAGE_KEYCLOAK, and the Keycloak CR has no spec.image. This SD's render,
+# apps/wave-1/keycloak.yaml, is not listed in apps/wave-1/kustomization.yaml and deploys nothing
+# (ci/render-golden.sh RENDER_GOLDEN_NOT_ONBOARDED). The tag records the operator's version for
+# readers; renovate.json5 disables Renovate for this image so it cannot raise PRs against a file
+# nothing deploys. The Keycloak version moves with the operator — update this tag by hand then.
 source:
-  image: quay.io/keycloak/keycloak
+  image: quay.io/keycloak/keycloak:26.0.6
 exposure: public              # login/redirect flows for internet-exposed services; hardened (docs/15; R-DNS/R-NET)
 egress: internet              # normal WAN egress (docs/03; R-NET-05)
 storage: