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

app/api/admin/users/[userId]/route.ts

@@ -1,6 +1,5 @@
 import { NextRequest, NextResponse } from "next/server";
 import { getPool } from "@/services/database";
-import { isUserAuthenticated } from "@/lib/server-auth";
 
 // DELETE - Supprimer complètement un utilisateur
 export async function DELETE(
@@ -8,12 +7,6 @@ export async function DELETE(
   { params }: { params: Promise<{ userId: string }> }
 ) {
   try {
-    // Vérifier l'authentification
-    const isAuthenticated = await isUserAuthenticated();
-    if (!isAuthenticated) {
-      return NextResponse.json({ error: "Non autorisé" }, { status: 401 });
-    }
-
     const { userId } = await params;
 
     if (!userId) {