feat(tradein): SQL migrations 030-032 — Yandex schema extensions
- 030_listings_alter_yandex.sql: 7 cols (yandex_offer_id, views_total_yandex,
publish_date_relative, sale_type_text, agency_name/founded_year/objects_count)
+ 2 partial indexes (yandex_offer_id, agency_name)
- 031_houses_alter_yandex.sql: 9 cols (yandex_jk_id/slug, commission_year/month,
total_area_ha, corpus_count, yandex_validated_at, yandex_total_listings,
has_panorama) + 2 partial indexes (yandex_jk_id, commission_year)
- 032_yandex_history.sql: enables source='yandex_valuation' on existing
house_placement_history + 2 indexes (hph_source_idx, hph_house_source_idx)
Foundation for YandexRealtyScraper v1 (Stages 2-9 follow on subsequent PRs).
Note: numbered 030-032 because 029 was already used by PR #448 (matching/
valuation/dynamics extensions). All BEGIN/COMMIT, ADD COLUMN IF NOT EXISTS,
nullable, idempotent.
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