init static method
Initialises the runtime. On web there is no isolate pool to warm — this
exists for API parity so main() code runs unchanged.
Implementation
static Future<void> init({int? isolatePoolSize}) async {
final cfg = NitroConfig.instance;
if (isolatePoolSize != null) cfg.isolatePoolSize = isolatePoolSize;
_log(NitroLogLevel.verbose, 'init', 'web runtime ready (no isolate pool on web)');
}