feat: implement user authentication and login modal, refactor backend

web/backend/services/fileWatcher.js

@@ -0,0 +1,41 @@
+import { watch } from 'chokidar';
+import { existsSync } from 'fs';
+import { PATHS } from '../config/constants.js';
+import { readJSON } from '../utils/fileUtils.js';
+import { broadcast } from './websocket.js';
+
+let watcher = null;
+
+// Inicializar file watcher
+export function initFileWatcher() {
+  // Watch files for changes
+  const filesToWatch = [PATHS.WORKERS].filter(p => existsSync(p));
+  
+  if (filesToWatch.length === 0) {
+    return;
+  }
+  
+  watcher = watch(filesToWatch, {
+    persistent: true,
+    ignoreInitial: true,
+  });
+  
+  watcher.on('change', async (path) => {
+    console.log(`Archivo cambiado: ${path}`);
+    if (path === PATHS.WORKERS) {
+      const workers = readJSON(PATHS.WORKERS);
+      broadcast({ type: 'workers_updated', data: workers });
+    }
+  });
+  
+  console.log('✅ File watcher inicializado');
+}
+
+// Detener file watcher
+export function stopFileWatcher() {
+  if (watcher) {
+    watcher.close();
+    watcher = null;
+  }
+}
+