fix: Use flexible type check for is_admin authorization gate

Change strict equality check (=== true) to loose check that works with
both integer 1 and boolean true values.

app/Providers/AppServiceProvider.php

@@ -33,8 +33,8 @@ class AppServiceProvider extends ServiceProvider
 
         // Authorization gates
         \Illuminate\Support\Facades\Gate::define('access-ops', function ($user) {
-            // Allow admin users to access ops
-            return $user->is_admin === true;
+            // Allow admin users to access ops (flexible type check)
+            return $user && $user->is_admin;
         });
     }
 }