Add TanStackRouterVite plugin for auto code splitting

vite.config.ts

@@ -1,9 +1,11 @@
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 import path from "path";
+import { TanStackRouterVite } from "@tanstack/router-plugin/vite";
 
 export default defineConfig({
   plugins: [
+    TanStackRouterVite({ autoCodeSplitting: true }),
     react(),
   ],
   resolve: {