feat: restructure routing and authentication for hidden layout and user login

frontend/src/routes/login.tsx

@@ -1,9 +1,14 @@
-import { createFileRoute } from '@tanstack/react-router'
+import { createFileRoute } from "@tanstack/react-router";
+import { LoginCard } from "../components/LoginCard";
 
-export const Route = createFileRoute('/login')({
+export const Route = createFileRoute("/login")({
   component: RouteComponent,
-})
+});
 
 function RouteComponent() {
-  return <div>Hello "/login"!</div>
+  return (
+    <>
+      <LoginCard />
+    </>
+  );
 }