Goal
Given book_url and quote_text, locate a matching quote on LiveLib and return a canonical https://www.livelib.ru/quote/... URL.
Inputs
book_url(string)quote_text(string)
Output
quote_url(string | null)
Notes
- Prefer exact/substring matches after normalization.
- If the quote cannot be verified on a quote page, return
quote_url = null.
See references in references/.