Failed to start javascript-tutorial-server following the instructions in README

### Description
* **Environment:**
* OS: macOS Sequoia 15.2 (24C101)
* Browser: Google Chrome 131.0.6778.266
* javascript-tutorial-server version: 2.0.0
* Node.js version: v22.6.0
* **Steps:**
1. Followed the instructions in [README](https://github.com/javascript-tutorial/server/blob/master/README.md#installation)
* **Expected behavior:**
1. After running ./edit ja, the server should start and articles should be accessible.
* **Actual behavior:**
1. The following log was output and the process did not proceed further:
- Although I provided an example in ja, I encountered the same issue when trying with en.

```
06:21:02.238Z INFO importWatch: Import complete
```

从 README 中的安装说明开始，使用 ./edit ja 重现问题，并记录报告中的 Node.js 和 macOS 版本。调查进程为何在“Import complete”之后停止；当服务器启动且文章可以按预期访问时，即视为完成。

由索引模型根据 Issue 内容生成。