Add Nuxt 4 app with OAuth/OIDC authentication and PWA support

- Integrated Authentik OAuth/OIDC authentication
- Added PWA functionality with offline support
- Created protected and public API endpoints
- Configured Docker deployment with Traefik
- Added Gitea Actions CI/CD workflow
- Included comprehensive setup documentation

.env.example

@@ -0,0 +1,14 @@
+# Dominio de la aplicación
+APP_DOMAIN=seguidordelotes.nucleoriofrio.com
+
+# OAuth Authentik Configuration
+NUXT_OAUTH_AUTHENTIK_CLIENT_ID=your-client-id-from-authentik
+NUXT_OAUTH_AUTHENTIK_CLIENT_SECRET=your-client-secret-from-authentik
+NUXT_OAUTH_AUTHENTIK_SERVER_URL=https://authentik.nucleoriofrio.com
+NUXT_OAUTH_AUTHENTIK_REDIRECT_URL=https://seguidordelotes.nucleoriofrio.com/auth/authentik
+
+# Public App URL
+NUXT_PUBLIC_APP_URL=https://seguidordelotes.nucleoriofrio.com
+
+# Session Secret (generar con: openssl rand -base64 32)
+NUXT_SESSION_PASSWORD=your-session-secret-minimum-32-characters