Update app.py

app.py

@@ -505,6 +505,7 @@ def handsome_chat_completions():
 
                                             first_chunk["choices"][0]["delta"]["content"] = ""
                                             first_chunk["choices"][0]["delta"]["reasoning_content"] = ""
+                                            first_chunk["choices"][0]["delta"]["role"] = "assistant"
                                             yield f"data: {json.dumps(first_chunk)}\n\n"
 
                                             openai_chunk["choices"][0]["delta"]["content"] = "<think>\n"