chore(deps): migrate to react-router 8 and refresh frontend dependencies

react-router-dom 7 is superseded by react-router 8, which folds the DOM
bindings back into the core package. RouterProvider now comes from
`react-router/dom`, while the hooks and `createBrowserRouter` move to
`react-router`. Updates the nine importing modules and the router line in
docs/architecture.md to match.

Also refreshes antd, react-i18next, storybook, eslint, lint-staged and
playwright to current patch/minor releases, and restores alphabetical order
in devDependencies for the @vitest/browser-playwright and playwright entries.

Bumps brace-expansion to 5.0.8, the only release outside the affected range
of GHSA-mh99-v99m-4gvg (unbounded expansion length causing an OOM crash).
`npm audit fix` could not apply this on its own: the lockfile pinned 5.0.7
and npm will not re-resolve a transitive-only dependency in place, so the
entry was updated directly and reinstalled.

frontend/src/layouts/AppSidebar.tsx

@@ -1,6 +1,6 @@
 import { useCallback, useEffect, useMemo, useState } from 'react';
 import type { ComponentType } from 'react';
-import { useLocation, useNavigate } from 'react-router-dom';
+import { useLocation, useNavigate } from 'react-router';
 import { useTranslation } from 'react-i18next';
 import { Drawer, Layout, Menu } from 'antd';
 import type { MenuProps } from 'antd';

frontend/src/layouts/PanelLayout.tsx

@@ -1,4 +1,4 @@
-import { Outlet } from 'react-router-dom';
+import { Outlet } from 'react-router';
 
 import { useWebSocketBridge } from '@/api/websocketBridge';
 import { usePageTitle } from '@/hooks/usePageTitle';