feat(web-tanstack): add TanStack Start app shell with tRPC client

apps/web-tanstack/src/routes/index.tsx

@@ -0,0 +1,14 @@
+import { createFileRoute } from "@tanstack/react-router";
+
+export const Route = createFileRoute("/")({
+  component: Home,
+});
+
+function Home() {
+  return (
+    <main>
+      <h1>Template — TanStack Start</h1>
+      <p>Clean Architecture Monorepo Template</p>
+    </main>
+  );
+}