Close 3 SQL schema findings from 2026-05-24 trade-in audit.
- Rename 030_listings_alter_yandex.sql -> 033_*.sql (resolve dup prefix with 030_avito_imv_cache_key_unique.sql).
- New 034_trade_in_estimates_geom.sql: PostGIS geom column + GIST index + backfill + BEFORE INSERT/UPDATE trigger.
- New 035_drop_duplicate_indexes.sql: drop listing_sources_listing_idx2 (dup of 028) and houses_geom_idx2 (dup of 009).
All idempotent. Deploy script uses ls|sort + no tracking table — rename is safe because original 030 already applied (IF NOT EXISTS no-op on re-run as 033).
