refactor!: replace Zustand global store with TanStack Query for systemFeatures

Follow-up to SSR prefetch migration (2833965). Eliminates the Zustand
middleman that was syncing TanStack Query data into a separate store.

- Remove useGlobalPublicStore Zustand store entirely
- Create hooks/use-global-public.ts with useSystemFeatures,
  useSystemFeaturesQuery, useIsSystemFeaturesPending, useSetupStatusQuery
- Migrate all 93 consumers to import from @/hooks/use-global-public
- Simplify global-public-context.tsx to a thin provider component
- Update 18 test files to mock the new hook interface
- Fix SetupStatusResponse.setup_at type from Date to string (JSON)
- Fix setup-status.spec.ts mock target to match consoleClient

BREAKING CHANGE: useGlobalPublicStore is removed. Use useSystemFeatures()
from @/hooks/use-global-public instead.

web/app/components/apps/list.tsx

@@ -27,7 +27,7 @@ import { ToastContext } from '@/app/components/base/toast'
 import CheckboxWithLabel from '@/app/components/datasets/create/website/base/checkbox-with-label'
 import { NEED_REFRESH_APP_LIST_KEY } from '@/config'
 import { useAppContext } from '@/context/app-context'
-import { useGlobalPublicStore } from '@/context/global-public-context'
+import { useSystemFeatures } from '@/hooks/use-global-public'
 import { CheckModal } from '@/hooks/use-pay'
 import { DSLImportStatus } from '@/models/app'
 import { fetchWorkflowOnlineUsers, importAppBundle } from '@/service/apps'
@@ -68,7 +68,7 @@ const List: FC<Props> = ({
 }) => {
   const { t } = useTranslation()
   const { notify } = useContext(ToastContext)
-  const { systemFeatures } = useGlobalPublicStore()
+  const systemFeatures = useSystemFeatures()
   const router = useRouter()
   const { push } = useRouter()
   const { isCurrentWorkspaceEditor, isCurrentWorkspaceDatasetOperator, isLoadingCurrentWorkspace } = useAppContext()