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-detail-panel/detail-header.spec.tsx

@@ -66,8 +66,7 @@ vi.mock('@/context/i18n', () => ({
 let mockEnableMarketplace = true
 
 vi.mock('@/context/global-public-context', () => ({
-  useGlobalPublicStore: (selector: (state: { systemFeatures: { enable_marketplace: boolean } }) => unknown) =>
-    selector({ systemFeatures: { enable_marketplace: mockEnableMarketplace } }),
+  useSystemFeatures: () => ({ enable_marketplace: mockEnableMarketplace }),
 }))
 
 vi.mock('@/context/modal-context', () => ({

web/app/components/plugins/plugin-detail-panel/detail-header.tsx

@@ -25,10 +25,10 @@ import UpdateFromMarketplace from '@/app/components/plugins/update-plugin/from-m
 import PluginVersionPicker from '@/app/components/plugins/update-plugin/plugin-version-picker'
 import { API_PREFIX } from '@/config'
 import { useAppContext } from '@/context/app-context'
-import { useGlobalPublicStore } from '@/context/global-public-context'
 import { useGetLanguage, useLocale } from '@/context/i18n'
 import { useModalContext } from '@/context/modal-context'
 import { useProviderContext } from '@/context/provider-context'
+import { useSystemFeatures } from '@/hooks/use-global-public'
 import useTheme from '@/hooks/use-theme'
 import { uninstallPlugin } from '@/service/plugins'
 import { useAllToolProviders, useInvalidateAllToolProviders } from '@/service/use-tools'
@@ -72,7 +72,7 @@ const DetailHeader = ({
   const { setShowUpdatePluginModal } = useModalContext()
   const { refreshModelProviders } = useProviderContext()
   const invalidateAllToolProviders = useInvalidateAllToolProviders()
-  const { enable_marketplace } = useGlobalPublicStore(s => s.systemFeatures)
+  const { enable_marketplace } = useSystemFeatures()
 
   const {
     id,

web/app/components/plugins/plugin-detail-panel/operation-dropdown.spec.tsx

@@ -11,8 +11,7 @@ vi.mock('react-i18next', () => ({
 }))
 
 vi.mock('@/context/global-public-context', () => ({
-  useGlobalPublicStore: <T,>(selector: (state: { systemFeatures: { enable_marketplace: boolean } }) => T): T =>
-    selector({ systemFeatures: { enable_marketplace: true } }),
+  useSystemFeatures: () => ({ enable_marketplace: true }),
 }))
 
 vi.mock('@/utils/classnames', () => ({

web/app/components/plugins/plugin-detail-panel/operation-dropdown.tsx

@@ -11,7 +11,7 @@ import {
   PortalToFollowElemContent,
   PortalToFollowElemTrigger,
 } from '@/app/components/base/portal-to-follow-elem'
-import { useGlobalPublicStore } from '@/context/global-public-context'
+import { useSystemFeatures } from '@/hooks/use-global-public'
 import { cn } from '@/utils/classnames'
 import { PluginSource } from '../types'
 
@@ -42,7 +42,7 @@ const OperationDropdown: FC<Props> = ({
     setOpen(!openRef.current)
   }, [setOpen])
 
-  const { enable_marketplace } = useGlobalPublicStore(s => s.systemFeatures)
+  const { enable_marketplace } = useSystemFeatures()
 
   return (
     <PortalToFollowElem