feat(message): add tool_call_id field to message schema

Author: jinliyl

flowllm/core/schema/message.py

@@ -29,6 +29,10 @@ def simple_dump(self, add_reasoning: bool = False) -> dict:
 
         if self.tool_calls:
             result["tool_calls"] = [x.simple_output_dump() for x in self.tool_calls]
+
+        if self.tool_call_id:
+            result["tool_call_id"] = self.tool_call_id
+
         return result
 
     @property