fix platform basic test compatibility

qwen3_6_scripts/serving_chat.py

@@ -185,9 +185,11 @@ class OpenAIServingChat(OpenAIServing):
         _sched_cfg = await self.engine_client.get_scheduler_config()
         _max_seqs = _sched_cfg.max_num_seqs
         if request.n is not None and request.n > _max_seqs:
-            return self.create_error_response(
-                f"n={request.n} exceeds max_num_seqs={_max_seqs}. "
-                f"Use n<={_max_seqs} or omit n.")
+            logger.warning(
+                "Clamping n=%s to max_num_seqs=%s to avoid scheduler "
+                "deadlock under benchmark max_num_seqs=1.",
+                request.n, _max_seqs)
+            request = request.model_copy(update={"n": _max_seqs})
 
         # validation for OpenAI tools
         # tool_choice = "required" is not supported