feat: implement user authentication and login modal, refactor backend

web/backend/routes/logs.js

@@ -0,0 +1,22 @@
+import express from 'express';
+import { basicAuthMiddleware } from '../middlewares/auth.js';
+import { getLogPath, readLogs } from '../utils/fileUtils.js';
+
+const router = express.Router();
+
+// Obtener logs (últimas líneas o nuevas líneas desde un número de línea)
+router.get('/', basicAuthMiddleware, (req, res) => {
+  try {
+    const logPath = getLogPath();
+    const sinceLine = parseInt(req.query.since) || 0;
+    const limit = parseInt(req.query.limit) || 500;
+    
+    const result = readLogs(logPath, { sinceLine, limit });
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+export default router;
+