feat(ui): surface TemporalDevServer resources in the operator UI

[bmorton]

Background

PR #63 added a read-only operator UI that surfaces TemporalClusters and their satellite CRDs (TemporalNamespace/TemporalClusterClient/TemporalSearchAttribute).

The TemporalDevServer CRD (#68) is a standalone, disposable dev server that is not related to a TemporalCluster, so it is intentionally out of scope for the initial UI.

Ask

Surface TemporalDevServer resources in the UI:

• Overview: list TemporalDevServers (phase / Ready / version / endpoint), e.g. a separate section or card style.
• Detail: per-devserver status, endpoint, persistence (ephemeral vs persistent), and related satellites whose clusterRef.Kind: TemporalDevServer point at it.
• Reuse the existing DataSource seam and view-model mapping patterns in internal/ui.

Notes

• Satellite CRDs now use spec.clusterRef of type ClusterReference{Name, Kind} (Kind enum TemporalCluster|TemporalDevServer, defaulting to TemporalCluster). The cluster-detail matcher already filters by Kind; a devserver-detail view should match Kind: TemporalDevServer.
• No new RBAC needed if the operator already watches TemporalDevServer.

Follow-up to #63.