logging: use canonical upstream image names (#433)

rke2's `registries.yaml` already rewrites upstream image names to the artifactapi mirror, so manifests must carry canonical upstream names. Only in-house `artifactapi.k8s.syd1.au.unkin.net/docker-internal/...` images stay explicit (logarchiver/logviewer are untouched).

Changes:
- Point the ClickHouseInstallation and the clickhouse-schema job at `docker.io/clickhouse/clickhouse-server:24.8`.
- Point the logviewer oauth2-proxy cert-combine init container at `docker.io/library/alpine:3`.
- Point the NATS bootstrap job at `docker.io/natsio/nats-box:0.18.0`.
- Point the NATS chart values at `docker.io/library/nats` and `docker.io/natsio/nats-server-config-reloader`.
- Point all three Vector values files (agent, aggregator, vm-ingest) at `docker.io/timberio/vector`.
- Drop the now-wrong "pulled through the artifactapi dockerhub remote" comments in the NATS and vector-agent values.

Tags/digests unchanged and the `repository`/`tag` split is preserved. `kustomize build --enable-helm apps/overlays/au-syd1/logging` differs from main only in those nine image strings.

Extra found, not changed here: `.woodpecker/vector-test.yaml` still pins its CI step image to `artifactapi.k8s.syd1.au.unkin.net/dockerhub/timberio/vector:0.57.0-debian`. That is a Woodpecker step image rather than a namespace manifest, so it is left out to keep this PR to the logging namespace — say the word and I will fix it separately.

Reviewed-on: #433
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

apps/base/logging/clickhouseinstallation.yaml

@@ -87,7 +87,7 @@ spec:
             runAsGroup: 101
           containers:
             - name: clickhouse
-              image: artifactapi.k8s.syd1.au.unkin.net/dockerhub/clickhouse/clickhouse-server:24.8
+              image: docker.io/clickhouse/clickhouse-server:24.8
               resources:
                 requests:
                   cpu: 500m

apps/base/logging/job_clickhouse-schema.yaml

@@ -32,7 +32,7 @@ spec:
         runAsGroup: 101
       containers:
         - name: clickhouse-schema
-          image: artifactapi.k8s.syd1.au.unkin.net/dockerhub/clickhouse/clickhouse-server:24.8
+          image: docker.io/clickhouse/clickhouse-server:24.8
           securityContext:
             allowPrivilegeEscalation: false
             readOnlyRootFilesystem: true

apps/base/logging/logviewer/oauth2-proxy-deployment.yaml

@@ -34,7 +34,7 @@ spec:
         # identity.unkin.net serves a Vault-PKI cert; combine the system roots
         # with the internal CA so oauth2-proxy's OIDC HTTP client trusts it.
         - name: combine-certs
-          image: artifactapi.k8s.syd1.au.unkin.net/dockerhub/library/alpine:3
+          image: docker.io/library/alpine:3
           imagePullPolicy: IfNotPresent
           command:
             - sh

apps/base/logging/nats-bootstrap-job.yaml

@@ -58,7 +58,7 @@ spec:
         runAsGroup: 1000
       containers:
         - name: nats-bootstrap
-          image: artifactapi.k8s.syd1.au.unkin.net/dockerhub/natsio/nats-box:0.18.0
+          image: docker.io/natsio/nats-box:0.18.0
           # nats CLI stats the working directory when loading its response
           # schemas; under readOnlyRootFilesystem + runAsUser 1000 the image's
           # default WORKDIR is not accessible ("stat .: permission denied"), so