fix: Remove undefined businesses() relation call in AssetAccountController

- Fixed 500 error on POST /api/asset-accounts/wizard
- business_id is now optional and only set if provided in request
- Previously tried to call User::businesses() which doesn't exist

VERSION

@@ -1 +1 @@
-1.57.0
+1.58.0

backend/app/Http/Controllers/Api/AssetAccountController.php

@@ -283,7 +283,10 @@ public function storeWithWizard(Request $request): JsonResponse
         // Criar o ativo
         $data = $validator->validated();
         $data['user_id'] = Auth::id();
-        $data['business_id'] = $request->business_id ?? Auth::user()->businesses()->first()?->id;
+        // business_id é opcional e vem do request se fornecido
+        if ($request->filled('business_id')) {
+            $data['business_id'] = $request->business_id;
+        }
         $data['status'] = 'active';
 
         $asset = AssetAccount::create($data);