must contain the cover image placeholder at beginning, then the 引用 block, then the rest of the article.
Structure requirements:
- Title: ≤30 chars, includes main keywords early.
- Summary: 50-70 Chinese characters complete sentence, includes main keyword, can be directly quoted by search engine snippet.
- Slug: English lowercase, hyphen-separated, 30-60 characters, covering main keyword in pinyin or English translation.
- Tags: 3-5 tags, include main keyword and high-frequency long-tail words.
Content structure:
- Immediately after the image, a > quote block (1 paragraph) 60-100 char of direct answer; no extra prefixes like TL;DR.
- Then an H1 (#) as the main heading.
- Then 3-6 H2 sections. Each H2's first sentence must be
