refactor: revew all design of services, clients, deadcode, ...

middleware.ts

@@ -30,7 +30,6 @@ export function middleware(request: NextRequest) {
 
   // Vérifier le cookie d'authentification (maintenant un UUID)
   const userUuid = request.cookies.get(COOKIE_NAME)?.value;
-
   if (!userUuid) {
     // Rediriger vers la page de login si pas authentifié
     const loginUrl = new URL("/login", request.url);