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/plugins/plugin-page/empty/index.spec.tsx

@@ -56,14 +56,10 @@ vi.mock('../context', () => ({
 
 // Mock global public store (Zustand store)
 vi.mock('@/context/global-public-context', () => ({
-  useGlobalPublicStore: (selector: (state: any) => any) => {
-    return selector({
-      systemFeatures: {
-        ...defaultSystemFeatures,
-        ...mockState.systemFeatures,
-      },
-    })
-  },
+  useSystemFeatures: () => ({
+    ...defaultSystemFeatures,
+    ...mockState.systemFeatures,
+  }),
 }))
 
 // Mock useInstalledPluginList hook

web/app/components/plugins/plugin-page/empty/index.tsx

@@ -11,7 +11,7 @@ import { MagicBox } from '@/app/components/base/icons/src/vender/solid/mediaAndD
 import InstallFromGitHub from '@/app/components/plugins/install-plugin/install-from-github'
 import InstallFromLocalPackage from '@/app/components/plugins/install-plugin/install-from-local-package'
 import { SUPPORT_INSTALL_LOCAL_FILE_EXTENSIONS } from '@/config'
-import { useGlobalPublicStore } from '@/context/global-public-context'
+import { useSystemFeatures } from '@/hooks/use-global-public'
 import { useInstalledPluginList } from '@/service/use-plugins'
 import Line from '../../marketplace/empty/line'
 import { usePluginPageContext } from '../context'
@@ -27,7 +27,7 @@ const Empty = () => {
   const fileInputRef = useRef<HTMLInputElement>(null)
   const [selectedAction, setSelectedAction] = useState<string | null>(null)
   const [selectedFile, setSelectedFile] = useState<File | null>(null)
-  const { enable_marketplace, plugin_installation_permission } = useGlobalPublicStore(s => s.systemFeatures)
+  const { enable_marketplace, plugin_installation_permission } = useSystemFeatures()
   const setActiveTab = usePluginPageContext(v => v.setActiveTab)
 
   const handleFileChange = (event: React.ChangeEvent<HTMLInputElement>) => {