feat(db): schema migration for bulk cadastre ingest layers (#168)
Add 7 cadastre layer tables + cadastre_jobs saga-state table.
Tables:
- cad_parcels (36368 ЗУ ЕГРН) replaces cad_parcels_geom
- cad_buildings v2 wide schema (replaces existing, backed up as cad_buildings_old_apr26)
- cad_constructions (36383 Сооружения + ЕГРН, flag is_egrn)
- cad_oncs (36384), cad_enk (39663), cad_zouit (4 categoryIds), cad_quarter_stats
- cadastre_jobs (resumable saga state, mirrors geo_jobs pattern)
GIST + BTREE indexes. Migration of cad_parcels_geom data via INSERT...SELECT.
Restore v_complex_full + v_complex_buildings views after table rename.
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