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

app/admin/page.tsx

@@ -1,17 +1,7 @@
-import { redirect } from "next/navigation";
-import { isUserAuthenticated } from "@/lib/server-auth";
 import { AdminService } from "@/services/admin-service";
 import { AdminClientWrapper } from "@/components/admin";
 
 export default async function AdminPage() {
-  // Vérifier l'authentification
-  const isAuthenticated = await isUserAuthenticated();
-
-  // Si pas de cookie d'authentification, rediriger vers login
-  if (!isAuthenticated) {
-    redirect("/login");
-  }
-
   // Charger les données côté serveur
   try {
     const adminData = await AdminService.getAdminData();