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.

scripts/sync-skills.ts

@@ -109,6 +109,8 @@ async function syncSkillsToDatabase(): Promise<void> {
         // Insérer/mettre à jour la skill (bulkInsert gère les conflits)
         await SkillsService.bulkInsertSkillsFromJSON([
           {
+            id: categoryFromFile.category.toLowerCase(),
+            name: categoryFromFile.category,
             category: categoryFromFile.category,
             icon: categoryFromFile.icon,
             skills: [skillFromFile],