blog 是做什么的?
Turn a blog post, article, notes, or any source material into a set of vertical poster images — one cover plus several coherent content slides that explain the core points. Renders HTML/CSS to exact-size PNGs via headless Chrome. Use whenever the user wants cover art, explanatory diagrams/illustrations, carousel slides, cover images, poster series, or "content images" from an article/content/source/file, especially for blog, public accounts (公众号), Xiaohongshu (小红书), or social posts. Default output is 1080×1920 PNG named 1.png (cover), 2.png, 3.png … written to the current working directory.