Phase 2.1 minimal foundation for #113 Layout Analysis (Макс feedback 12.05).
Без layout_type/balcony_count (отсутствуют в БД, ждут B2B Объектив #52).
Added:
- 7 Pydantic schemas в schemas/parcel.py: LayoutSignature, BestLayoutsRequest,
TopLayoutRow, LayoutTzMixRow, LayoutTzRecommendation, LayoutDataQuality,
BestLayoutsResponse
- services/site_finder/layout_signature.py: room_bucket_from_flat /
area_bin / layout_signature (3 pure-Python helpers, no DB)
- tests/test_layout_signature.py: 27 unit tests (parametrized)
No DB / API changes — foundation для PR B (mv_layout_velocity) и PR C
(POST /best-layouts endpoint).
