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_api/src/schema.rs

@@ -100,6 +100,7 @@ pub struct RegisterRequest {
 }
 
 #[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
 pub struct LoginRequest {
     pub username_or_email: String,
     pub password: String,