🔧 Set TanStack Router devtools only in dev mode (#668)

frontend/src/routes/__root.tsx

@@ -1,13 +1,24 @@
+import React, { Suspense } from 'react'
 import { createRootRoute, Outlet } from '@tanstack/react-router'
-import { TanStackRouterDevtools } from '@tanstack/router-devtools'
 
 import NotFound from '../components/Common/NotFound'
 
+const TanStackRouterDevtools =
+  process.env.NODE_ENV === 'production'
+    ? () => null
+    : React.lazy(() =>
+        import('@tanstack/router-devtools').then((res) => ({
+          default: res.TanStackRouterDevtools,
+        })),
+      )
+
 export const Route = createRootRoute({
   component: () => (
     <>
       <Outlet />
-      <TanStackRouterDevtools />
+      <Suspense>
+        <TanStackRouterDevtools />
+      </Suspense>
     </>
   ),
   notFoundComponent: () => <NotFound />,