Enhance user metadata display with app and outpost information

- Update AuthentikUser interface to include appSlug and outpostName
- Capture x-authentik-meta-app and x-authentik-meta-outpost headers
- Improve UserMetadata component to display connection information
- Filter empty groups from groups array
- Add documentation about available Authentik headers

nuxt4/app/server/api/debug/headers.ts

@@ -16,6 +16,12 @@ export default defineEventHandler((event) => {
     }
   }
 
+  // Log en consola del servidor para debugging
+  console.log('=== AUTHENTIK HEADERS ===')
+  console.log(JSON.stringify(authentikHeaders, null, 2))
+  console.log('=== ALL HEADERS ===')
+  console.log(JSON.stringify(allHeaders, null, 2))
+
   return {
     authentikHeaders,
     allHeaders