Fix director role access when no groups are assigned

Resolve issue where directors without assigned groups were returned all groups, by returning an empty array instead.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 28b81ac1-a55f-409c-b6a9-88ad420d8a9a
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/28b81ac1-a55f-409c-b6a9-88ad420d8a9a/6PoDWd4

server/routes.ts

@@ -102,6 +102,14 @@ export async function registerRoutes(app: Express): Promise<Server> {
           filteredGroupsCount: userGroups.length,
           groups: userGroups.map((g: any) => ({ id: g.id, name: g.name }))
         });
+        
+        // CRITICAL: Si un directeur n'a aucun groupe assigné, retourner un tableau vide
+        // au lieu de tous les groupes
+        if (user.role === 'directeur' && userGroups.length === 0) {
+          console.log('🚨 [CRITICAL] Directeur has no assigned groups - returning empty array');
+          return res.json([]);
+        }
+        
         res.json(userGroups);
       }
     } catch (error) {