Wire up react-router with a root layout route and an index home page, following the single-arborescence conventions: pages live under pages/, routes are built from AppRoute via routeFromAppRoute, and route bundles load lazily behind a Suspense fallback. Add the @probo/routes and @probo/react-lazy workspace dependencies that the route setup relies on. Signed-off-by: Émile Ré <emile@probo.com>