refactor: update authentication flow and cookie management

- Changed COOKIE_NAME from "peakSkills_userId" to "session_token" for better clarity.
- Updated AuthClient to handle login and registration with new data structures.
- Enhanced AuthWrapper to manage user sessions and display appropriate messages.
- Added error handling in LoginForm and RegisterForm for better user feedback.
- Refactored user service methods to streamline user creation and verification processes.

app/api/auth/logout/route.ts

@@ -0,0 +1,29 @@
+import { NextResponse } from "next/server";
+
+export async function POST() {
+  try {
+    // Créer la réponse
+    const response = NextResponse.json(
+      { message: "Déconnexion réussie" },
+      { status: 200 }
+    );
+
+    // Supprimer le cookie de session
+    response.cookies.set("session_token", "", {
+      httpOnly: true,
+      secure: process.env.NODE_ENV === "production",
+      sameSite: "lax",
+      maxAge: 0, // Expire immédiatement
+      path: "/",
+    });
+
+    return response;
+  } catch (error) {
+    console.error("Logout error:", error);
+    return NextResponse.json(
+      { error: "Erreur interne du serveur" },
+      { status: 500 }
+    );
+  }
+}
+