T5: remove stale T1 stub index.tsx (replaced by _app/index.tsx)

apps/web/src/routes/index.tsx

@@ -1,17 +0,0 @@
-import { createRoute } from "@tanstack/react-router";
-import { Route as rootRoute } from "./__root";
-
-function HomePage() {
-  return (
-    <div className="flex flex-col items-center justify-center min-h-screen p-8">
-      <h1 className="text-4xl font-bold mb-4">Project E — UI Redesign</h1>
-      <p className="text-lg text-muted-foreground">Phase 1 Scaffold</p>
-    </div>
-  );
-}
-
-export const Route = createRoute({
-  getParentRoute: () => rootRoute,
-  path: "/",
-  component: HomePage,
-});