feat: restore cluster detail surface, gate cluster-list name link via plugin

The "chore: hide cluster detail" change had commented out both the
cluster-detail route and the cluster name link in the list. The
detail page component still ships in the OSS tree, so reach is
restored but the link is plugin-gated rather than unconditional:
plain OSS renders the name as a span; with a registered
`clusterDetail.linkableName` flag the name turns into a
`Typography.Link` that fires the parent's existing `onCellClick`
(which navigates to the detail route).

Detail tabs adjustments for the in-cluster context:
- Drop the Deployments tab (deployments are managed from the
  top-level Models page; the detail view is scoped to a single
  cluster's hardware).
- `WorkerList` and `GPUList` accept an optional `clusterId`. When
  set, the list pins `cluster_id` in its query and hides the
  cluster-filter dropdown so the user can't scope away from the
  cluster they're inside.

`clusterDetail.extraTabs(clusterId, intl)` exposes a plugin slot
that appends additional tab items — used by the enterprise plugin
to inject per-cluster Access / Quotas surfaces. No-op without a
plugin.

config/routes.ts

@@ -302,16 +302,16 @@ const baseRoutes = [
           '/cluster-management/clusters/create'
         ]
       },
-      // {
-      //   name: 'clusterDetail',
-      //   path: '/cluster-management/clusters/detail',
-      //   key: 'clusterDetail',
-      //   icon: 'icon-cluster2-outline',
-      //   selectedIcon: 'icon-cluster2-filled',
-      //   defaultIcon: 'icon-cluster2-outline',
-      //   hideInMenu: true,
-      //   component: './cluster-management/cluster-detail'
-      // },
+      {
+        name: 'clusterDetail',
+        path: '/cluster-management/clusters/detail',
+        key: 'clusterDetail',
+        icon: 'icon-cluster2-outline',
+        selectedIcon: 'icon-cluster2-filled',
+        defaultIcon: 'icon-cluster2-outline',
+        hideInMenu: true,
+        component: './cluster-management/cluster-detail'
+      },
       {
         name: 'credentials',
         path: '/cluster-management/credentials',