Replace whole-HTML re.search for status with a 3-level block-scoped strategy:
1. CSS badge classes (status/badge/tag/chip/label) — highest precision.
2. Proximity to block labelled «Статус» via _find_text_near.
3. Full blocks scan where sold/reserved keywords always beat free —
preventing «в продаже» from nav/similar-flats sections from
misclassifying sold flats as free.
Add _STATUS_KW_RE and _classify_status_kw at module level with full
morphological coverage: продан/продана/продано, реализован[аоы]?,
забронирован[аоы]?, свободн[аоы]?.
Add 31 tests in test_domrf_catalog_parse.py covering all three
extraction levels plus regression for fem. word-form «Квартира продана».
