feat(posts): add EP73 Axiom logging episode with cover art and transcript support

[AnnatarHe]

Summary

Adds EP73《Axiom 日志：哪 26 个人拿走了我的电影票？》, releasing today at 17:30 (Beijing), and the reusable per-episode cover-art and subtitle support the episode needs — neither existed in the codebase before.

Affected pages

• New /posts/ep73/ — YouTube UuwMMLmO7MQ, status: published, publicationDate: 2026-08-31 17:30:00. Go-live is controlled by when this merges. 小宇宙 and Bilibili links land in a follow-up commit, matching the EP72 pattern.
• All episode pages and /rss.xml gain optional cover-art and transcript rendering (no visible change for episodes without those files).

Episode media, by convention

Both assets are resolved by slug rather than frontmatter, so an episode picks them up the moment the file lands and renders correctly while it is missing — no schema change, no broken build in between:

Asset	Path
Square cover art	src/assets/<episode>/cover.{jpg,jpeg,png,webp}
Subtitles	public/subtitles/<episode>.srt

Cover art renders beside the episode title (EpisodeCover.astro, Astro-optimized with a srcset) and is added to JSON-LD image and the RSS <itunes:image>. The generated 1200×630 Satori image stays as og:image/twitter:image — 1:1 is the wrong ratio for social cards.

Subtitles are parsed at build time (src/lib/srt.ts) into a collapsible 文字稿 section with [mm:ss] paragraph timestamps, a .srt download link, and JSON-LD transcript. The parser strips inline tags (<i>, {\an8}), collapses repeated cues common in auto-generated SRT, and breaks paragraphs on sentence endings or a pause longer than 2.5s, so a paragraph's timestamp always matches its content.

The EP73 cover and .srt files are not in this PR — they get dropped at the paths above.

Verification

• pnpm astro check — 0 errors.
• pnpm build (runs astro check && astro build && pnpm seo:check) — passes in both states: with test cover + .srt present, and without them (the state committed here). SEO validation passed: 78 HTML pages, 78 sitemap URLs, 76 RSS items.
• pnpm preview + browser inspection of /posts/ep73/ at 1280px and 390px, with and without the media files:
  • exactly one <h1> and one og:image (both asserted by scripts/check-seo.mjs);
  • JSON-LD parses, image becomes an array when a cover exists, transcript present only when an .srt exists;
  • the 文字稿 <details> expands, timestamps read [00:00] [00:14] [00:29] [01:20] — correctly broken at the silence gap — and the download link resolves to /subtitles/ep73.srt;
  • /posts/ep73-og.png renders with the correct title (the EP73 prefix is required by the title regex in [...slug]-og.png.ts);
  • /rss.xml is well-formed, the new item is first, and <itunes:image> is emitted only when a cover exists.
• No new routes, so the htmlFiles === publishedEpisodes + 2 assertion still holds — the transcript renders inline and the .srt is served from public/.

Screenshots were taken locally against pnpm preview using throwaway placeholder media (a solid-gradient square cover and a 9-cue sample .srt); those files are not committed, so they are not attached here. The layout is: cover left, title and excerpt right on desktop, stacked on mobile; the 文字稿 section sits between the video embed and the shownotes.

Note

Unrelated pre-existing issue spotted while verifying: the Async Talk (asynctalk.com) - Episode N footer line in the generated OG images is not rendering — EP72's OG image is missing it too. Not touched here.

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