feat: task 1.7 routing skeleton

TanStack Router file-based routes:
- vite.config.ts: TanStackRouterVite plugin (target: react,
  autoCodeSplitting: true) before the React plugin.
- .gitignore: src/routeTree.gen.ts (auto-generated).
- src/lib/query-client.ts: module-level QueryClient singleton.
- src/routes/__root.tsx: root route, QueryClientProvider, Suspense-
  wrapped router + query devtools (dev-only via import.meta.env.DEV).
- src/routes/login.tsx: public route. validateSearch schema accepts
  optional redirect. LoginRoute wraps <LoginPage> with onAuthenticated
  navigating to redirect ?? '/'.
- src/routes/_authed/route.tsx: pathless protected layout. beforeLoad
  redirects to /login on 'anonymous'; falls through on 'unknown' /
  'authenticating' so hard reload doesn't flash the login page.
- src/routes/_authed/index.tsx: placeholder home with sign-out button.
  Cross-tab logout effect bounces to /login on store transition.
- src/App.tsx: replaced — now creates the router and renders
  <RouterProvider />. The interim status-branching logic from 1.6 is
  gone (the route tree handles it).
- eslint.config.js: override for src/routes/** disabling
  react-refresh/only-export-components — TanStack Router's file-based
  pattern intentionally co-exports Route alongside components.

Code-splitting working: login chunk 37KB, home + auth 17KB, card
primitive 31KB, all loaded lazily; main bundle 353KB.

Deviations:
1. No top-level useRequireAuth hook — per-page useEffect on store
   transitions is just as effective and only used in one place.
2. ESLint override for src/routes/** matches the existing pattern for
   src/ui/primitives/**.
3. Login page's auto-navigate effect from 1.6 is removed — the route
   wrapper owns navigation via onAuthenticated.

.planning/ROADMAP.md

@@ -55,7 +55,7 @@ These rules govern every task. Any deviation must be discussed and documented as
 | 1.4  | [Runtime config endpoint](./phase-1-foundation/04-runtime-config.md)                                         | 🟩     | `8e2151a` |
 | 1.5  | [Directus auth client (cookie mode + refresh)](./phase-1-foundation/05-directus-auth-client.md)              | 🟩     | `38fe2e3` |
 | 1.6  | [Login page](./phase-1-foundation/06-login-page.md)                                                          | 🟩     | `7215cb5` |
-| 1.7  | [Routing skeleton (TanStack Router + role-aware guards)](./phase-1-foundation/07-routing-skeleton.md)        | ⬜     | —         |
+| 1.7  | [Routing skeleton (TanStack Router + role-aware guards)](./phase-1-foundation/07-routing-skeleton.md)        | 🟩     | `PENDING_SHA` |
 | 1.8  | [Logout flow](./phase-1-foundation/08-logout-flow.md)                                                        | ⬜     | —         |
 | 1.9  | [Gitea CI + Dockerfile + nginx static serve](./phase-1-foundation/09-gitea-ci-and-dockerfile.md)             | ⬜     | —         |
 | 1.10 | [Compose service block in trm/deploy](./phase-1-foundation/10-deploy-compose-block.md)                       | ⬜     | —         |