Add more debug logging to trace stream iteration

llm/oai.py

@@ -158,6 +158,7 @@ class TextChatAtOAI(BaseFnCallModel):
                     logger.error(f"An OpenAI error occurred: {ex}")
                     raise ModelServiceError(exception=ex) from ex
 
+            logger.info(f'delta_stream={delta_stream}, response={response}')
             if delta_stream:
                 chunk_count = 0
                 for chunk in response:
@@ -184,6 +185,7 @@ class TextChatAtOAI(BaseFnCallModel):
                             function_json = json.dumps(function_call, ensure_ascii=False)
                             yield [Message(role=ASSISTANT, content=f'<tool_call>{function_json}</tool_call>')]
                         logger.info(f'delta_stream message chunk: {chunk}')
+                logger.info(f'delta_stream finished, total chunks: {chunk_count}')
             else:
                 full_response = ''
                 full_reasoning_content = ''