feat(nspd): denorm nspd_parcels + nspd_buildings tables (#94 PR3 of 4)
- data/sql/99_nspd_entities_denorm.sql: 2 tables (cad_num PK) + 6 indexes
(quarter_cad, GIST geom, partial WHERE purpose ILIKE '%многокв%')
- nspd_denorm.py: denorm_parcel_feature / denorm_building_feature / denorm_dump
- SAVEPOINT per row via with db.begin_nested()
- ST_Transform(ST_SetSRID(ST_GeomFromGeoJSON(:geom), 3857), 4326)
- json.dumps(geom, ensure_ascii=False) for psycopg bind
- All CAST(:x AS type) — no ❌:type
- nspd_sync.py: inline denorm after _upsert_dump in harvest_quarter (non-fatal)
- nspd_denorm_backfill.py: Celery one-shot task (per-quarter commit)
- admin_etl.py: POST /api/v1/admin/etl/nspd-denorm-backfill (AdminTokenAuth)
- 19 tests: coerce helpers, denorm parcel/building, aggregate counts
Foundation for downstream features (МКД neighbors lookup, parcel attrs).
Part of #94
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