remove dumb auth

frontend/src/main.tsx

@@ -2,14 +2,11 @@ import React from 'react';
 import ReactDOM from 'react-dom/client';
 import { BrowserRouter } from 'react-router-dom';
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
-import axios from 'axios';
 import { ToastProvider } from './components/ToastContext';
-import { setupAuthInterceptors } from './auth/authInterceptor';
 import { ThemeProvider, initializeThemeMode } from './theme/ThemeProvider';
 import App from './App';
 import './index.css';
 
-setupAuthInterceptors(axios);
 initializeThemeMode();
 
 const queryClient = new QueryClient({