Add debug logging to worker_training message reception

vidai/worker_training.py

@@ -60,6 +60,8 @@ def worker_process(backend_type: str):
     while True:
         try:
             message = comm.receive_message()
+            if message:
+                print(f"DEBUG: Worker {os.getpid()} received message: {message}")
             if message and message.msg_type == 'train_request':
                 print(f"DEBUG: Worker received train_request: {message.msg_id}")
                 data = message.data