fix: clean up admin exports and enhance skill category structure

- Removed unused export for management pages in admin index.
- Added id and name properties to skills being synced from JSON, improving data integrity for skill categories.

components/admin/index.ts

@@ -3,7 +3,6 @@ export * from "./overview";
 
 // Nouveaux composants de gestion
 export * from "./layout";
-export * from "./management/pages";
 
 // Composants réutilisables pour l'arborescence
 export * from "./management";