src/routes/ui.js

const express = require('express');
const path = require('path');
const router = express.Router();

// Serve HTML UI
router.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, '../views/index.html'));
});

router.get('/upload', (req, res) => {
  res.sendFile(path.join(__dirname, '../views/upload.html'));
});

module.exports = router;