Inject the host's `useTableFetch` hook into the CoreUIProvider's
`hooks` prop alongside the already-wired `useCurrentUser`, so plugins
that import `useTableFetch` from `@gpustack/core-ui` resolve it through
the host instead of throwing
"`hooks.useTableFetch is not a function`" at the first list-page render.
Companion to the earlier `feat: add use current user` change — core-ui
exposes both hooks as host-injected, but only the user hook had been
plumbed.
Add a single host-side mount point in extraRender.tsx:
const OrgSwitcher = pluginManager?.components?.OrgSwitcher;
...
{OrgSwitcher && <OrgSwitcher />}
A registered plugin can supply an Org switcher via
components.OrgSwitcher. When no plugin provides it, the host
renders nothing here, so the build is visually unchanged.
