[Bug]: ModuleNotFoundError: No module named 'agentscope.app._service._download_token'

### Prerequisites

- [x] I have searched the existing [issues](https://github.com/agentscope-ai/agentscope/issues) and [discussions](https://github.com/agentscope-ai/agentscope/discussions), and this is not a duplicate.
- [x] This is a bug, not a usage question. (For questions, please use [Discussions](https://github.com/agentscope-ai/agentscope/discussions/new?category=general) instead.)

### Background / Description

拉代码之后，启动服务报错

### Error Messages

```shell
ModuleNotFoundError: No module named 'agentscope.app._service._download_token'
```

### Steps to Reproduce

uv python run examples/agent_service/main.py

### Environment

- AgentScope Version: latest
- Python Version: 3.12
- OS: win