修复模型回复没有发送问题

src/routers/chat.py

@@ -190,6 +190,7 @@ async def chat_stream(request: ChatRequest):
                 subgraphs=True
                 # 不再需要，行為已包含
         ):
+            logger.info(event)
             # 取得 checkpoint_id（可選，視前端是否真的需要）
             latest_state = await app.aget_state(current_config)
             configurable = latest_state.config.get("configurable", {})
@@ -228,7 +229,7 @@ async def chat_stream(request: ChatRequest):
                     }
 
                     if isinstance(message, AIMessageChunk):
-                        if message.tool_call_chunks:
+                        if node_name != 'Researcher' and not message.tool_call_chunks:
                             payload_out.update({
                                 "type": "delta",
                                 "is_delta": True,