[Bugfix] Set PREEMPTED status when moving requests from running to waiting queue (#1893)

Signed-off-by: gcanlin <canlinguosdu@gmail.com>

vllm_omni/distributed/omni_connectors/transfer_adapter/chunk_transfer_adapter.py

@@ -302,6 +302,7 @@ class OmniChunkTransferAdapter(OmniTransferAdapterBase):
         )
         while len(running_queue) > self.scheduler_max_num_seqs:
             request = running_queue.pop()
+            request.status = RequestStatus.PREEMPTED
             waiting_queue.prepend_requests([request])
 
     def restore_queues(self, waiting_queue: Any, running_queue: list[Request]) -> None: