grafana: deploy Grafana instance, datasource and dashboards (#238)

## Why
Deploys Grafana in-cluster (observability project) via the grafana-operator, mirroring the puppet Grafana but modernised — **CNPG** for state, **Authentik OIDC** for auth — and ports the live datasource + dashboards in as CRs.

Depends on: grafana-operator (#235, merged), grafana schemas (#236, merged), Authentik OIDC (terraform-authentik #2), Vault seeds (done), and `^grafana/` image proxy (terraform-artifactapi #5).

## Changes (`apps/base/grafana`)
- **CNPG** postgres Cluster + rw Pooler (db `grafana`); **VaultAuth** + **VaultStaticSecrets** pulling `postgres`/`oauth` credentials from `kv/kubernetes/namespace/grafana/default/*`.
- **Grafana CR**: postgres backend via the pooler; Authentik `generic_oauth` (client id/secret from the Vault-synced secret, openid/email/profile scopes, group→role mapping); `root_url` grafana.k8s.syd1.au.unkin.net.
- **1 GrafanaDatasource** — k8s VictoriaMetrics via the operator `vmselect-main` service; reuses the previous default datasource uid so the imported dashboards resolve unedited.
- **13 GrafanaDashboards** (gzipJson) exported from the current grafana.
- **Gateway API** (traefik-internal) + HTTPRoute for grafana.k8s.syd1.au.unkin.net.
- Registered in the observability ApplicationSet + project.

## Review notes
- OAuth `role_attribute_path` maps Authentik group `grafana-admins` → Admin, else Viewer — **confirm the group name**.
- `database.ssl_mode: require` against the CNPG pooler — adjust if the pooler isn't serving TLS.
- The `VictoriaLogs - cluster` dashboard has no in-cluster logs datasource yet (no VictoriaLogs in k8s) — included for completeness, will be empty until one exists.
- `make kubeconform` clean (24 resources, validated against the strict grafana schemas).

Reviewed-on: #238
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>

apps/base/grafana/dashboards/puppet-report.yaml

@@ -0,0 +1,13 @@
+---
+apiVersion: grafana.integreatly.org/v1beta1
+kind: GrafanaDashboard
+metadata:
+  name: puppet-report
+  namespace: grafana
+spec:
+  instanceSelector:
+    matchLabels:
+      dashboards: "grafana"
+  resyncPeriod: 5m
+  allowCrossNamespaceImport: false
+  gzipJson: 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