feat(tradein): conflict_resolution — register Yandex sources in priority dicts (#471)
Stage 7/9 YandexRealtyScraper v1 (Wave 5). Integrates 4 Yandex scrapers into cross-source field-priority arbitration.
- HOUSE_FIELD_PRIORITY: lat/lon → yandex_realty_nb; +year_built/house_type/house_class/rating_score/reviews_count Yandex sources
- New house fields: text_reviews_count, corpus_count, total_area_ha, commission_year/month, developer_name, has_panorama, yandex_total_listings, has_lift, ceiling_height
- LISTING_FIELD_PRIORITY: description/house_type +yandex_detail
- New listing fields (all yandex_detail): agency_name/founded_year/objects_count, views_total_yandex, publish_date_relative, sale_type_text
- 37 unit tests (7 pre-existing + 30 new), all pass; ruff clean
- Resolver engine _resolve() unchanged (this PR creates the file initially)
Refs: decisions/Cross_Source_Matching_Strategy.md sec 3.5+4.5, decisions/YandexRealtyScraper_v1_Implementation_Plan.md Stage 7.
lekss361
7d649f9239