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

app/admin/manage/page.tsx

@@ -1,15 +1,6 @@
 import { redirect } from "next/navigation";
-import { isUserAuthenticated } from "@/lib/server-auth";
 
 export default async function ManageAdminPage() {
-  // Vérifier l'authentification
-  const isAuthenticated = await isUserAuthenticated();
-
-  // Si pas de cookie d'authentification, rediriger vers login
-  if (!isAuthenticated) {
-    redirect("/login");
-  }
-
   // Rediriger vers la page skills par défaut
   redirect("/admin/manage/skills");
 }