抓取微信公众号文章，提取标题和内容并输出为 Markdown 格式。支持多种提取方式。
Initial release: fetch and extract WeChat article titles and content as Markdown. - Supports input via public WeChat article links. - Tries multiple extraction methods: r.jina.ai, direct fetch, and browser automation. - Outputs clean Markdown with title, publication date, official account, and body. - Provides usage instructions and sample output. - Notes limitations with anti-crawling and captchas on some articles.