- Split chapter TTS into up to 10 paragraph-aligned parts; part 0 is
generated synchronously so playback starts immediately, parts 1-9 and
the final merge happen in a background goroutine
- New routes: GET /ui/audio/{slug}/{n}/status (merge poll) and
GET /ui/audio-file/{slug}/{n}/part/{p} (serve individual part)
- JS polls status every 3 s and seamlessly swaps audio.src to the merged
file once ready, preserving playback position proportionally
- Home page scrape form replaced with a ranking-search autocomplete:
type a title/author to see matching ranking items (cover + metadata),
click or keyboard-select to inject the source URL, or paste a raw URL
directly; ranking data is embedded as JSON at page render time
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