feat: refactor frontend routing and authentication

- Changed root div ID from 'root' to 'app' in index.html.
- Updated package.json to include new dependencies for routing and state management.
- Removed App component and replaced it with a router setup in main.tsx.
- Added route definitions for login, about, and index pages.
- Implemented authentication logic using Zustand for state management.
- Created API client with Axios for handling requests and token management.
- Added CORS support in the backend API.
- Updated schema for login requests to use camelCase.

libertas-frontend/src/routes/about.tsx

@@ -0,0 +1,14 @@
+import { createFileRoute } from "@tanstack/react-router";
+import * as React from "react";
+
+export const Route = createFileRoute("/about")({
+  component: AboutComponent,
+});
+
+function AboutComponent() {
+  return (
+    <div className="p-2">
+      <h3>About</h3>
+    </div>
+  );
+}