Add `markdown-link-check` with `pre-commit` to check for dead links in Markdown files

https://github.com/tcort/markdown-link-check

https://github.com/tcort/markdown-link-check?tab=readme-ov-file#run-as-a-pre-commit-hook

```
- repo: https://github.com/tcort/markdown-link-check
rev: ...
hooks:
- id: markdown-link-check
args: [-q]
```

We will need a config file with various rules:

https://github.com/tcort/markdown-link-check?tab=readme-ov-file#config-file-format

从 issue 中链接的 markdown-link-check README 部分开始，尤其是“Run as a pre-commit hook”和“Config file format”。确定 repository 的 pre-commit 配置位置，添加 hook 及其必需的规则，然后对 Markdown 文件运行已配置的 pre-commit 检查，确认死链会按预期被报告。

由索引模型根据 Issue 内容生成。