add all controllers logic

app/Policies/NavItemPolicy.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\NavItem;
+use App\Models\User;
+
+class NavItemPolicy
+{
+    public function manage(User $user): bool
+    {
+        $roles = $user->roles()->pluck('roles.name')->map(fn ($name) => strtolower((string) $name))->toArray();
+        return in_array('admin', $roles, true) || in_array('administrator', $roles, true);
+    }
+}