feat: implement user authentication and login modal, refactor backend

web/backend/config/constants.js

@@ -0,0 +1,34 @@
+import { fileURLToPath } from 'url';
+import { dirname, join } from 'path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+// En Docker, usar PROJECT_ROOT de env, sino usar ruta relativa
+// Desde config/constants.js necesitamos ir 3 niveles arriba para llegar al root del proyecto
+const PROJECT_ROOT = process.env.PROJECT_ROOT || join(__dirname, '../../..');
+
+export const PATHS = {
+  PROJECT_ROOT,
+  CONFIG: join(PROJECT_ROOT, 'config.yaml'),
+  WORKERS: join(PROJECT_ROOT, 'workers.json'),
+  PUSH_SUBSCRIPTIONS: join(PROJECT_ROOT, 'push-subscriptions.json'),
+  VAPID_KEYS: join(PROJECT_ROOT, 'vapid-keys.json'),
+};
+
+export const SERVER = {
+  PORT: process.env.PORT || 3001,
+};
+
+export const RATE_LIMIT = {
+  POINTS: 100,
+  DURATION: 60, // segundos
+  BLOCK_DURATION: 60, // segundos
+};
+
+export const ARTICLE_MONITORING = {
+  CHECK_INTERVAL: 3000, // milisegundos
+};
+
+export const VAPID_CONTACT = 'mailto:admin@pribyte.cloud';
+