Add middleware to protect admin routes

app/Http/Middleware/IsAdmin.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Middleware;
+
+use App\Models\User;
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+final readonly class IsAdmin
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param Closure(Request): (Response) $next
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        /** @var User $user */
+        $user = auth()->user();
+
+        if (!$user->isAdmin()) {
+            abort(403, __('Admin access required'));
+        }
+
+        return $next($request);
+    }
+}