fix: adjust formatting and remove unnecessary type hints in app.php

bootstrap/app.php

@@ -10,9 +10,12 @@
         commands: __DIR__ . '/../routes/console.php',
         health: '/up',
     )
-    ->withMiddleware(function (Middleware $middleware): void {
-        //
+    ->withMiddleware(function (Middleware $middleware) {
+        // Daftarkan alias di sini
+        $middleware->alias([
+            'prevent-back' => \App\Http\Middleware\PreventBackHistory::class,
+        ]);
     })
-    ->withExceptions(function (Exceptions $exceptions): void {
+    ->withExceptions(function (Exceptions $exceptions) {
         //
     })->create();