ob_flush(): No buffer to flush error during streaming in DataProtocolAdapter

I’m getting the following error while using PrismPHP streaming:

```
ErrorException: ob_flush(): Failed to flush buffer. No buffer to flush
in vendor/prism-php/prism/src/Streaming/Adapters/DataProtocolAdapter.php:38
```

Environment:

* Laravel 12
* PHP 8.4
* Nginx + PHP-FPM

The error happens because `DataProtocolAdapter` calls `ob_flush()` even when **no output buffer is active**.