[WIP][Bugfix][MiniCPM-o] Fix Full duplex bugs for minicpm-challenge (#5496)

Signed-off-by: Sy03 <1370724210@qq.com>

vllm_omni/entrypoints/cli/serve.py

@@ -892,7 +892,7 @@ def run_headless(args: TrackingNamespace) -> None:
     stage_connector_spec = get_stage_connector_spec(
         omni_transfer_config=omni_transfer_config,
         stage_id=stage_id,
-        async_chunk=False,
+        async_chunk=bool(stage_cfg.engine_args.get("async_chunk", False)),
     )
 
     # ``runtime_cfg`` is mostly inherited from the parent's