Add tool_call_id field to Message model

- Add optional tool_call_id field to Message model
- Required for tool response messages (role:tool)
- Identifies which tool call the response is for
- Fixes 400 errors for missing tool_call_id in tool messages

aisbf/models.py

@@ -30,6 +30,7 @@ class Message(BaseModel):
     role: str
     content: Union[str, List[Dict], List, None] = None
     tool_calls: Optional[List[Dict]] = None
+    tool_call_id: Optional[str] = None
 
 class ChatCompletionRequest(BaseModel):
     model: str