Move the shared atlas-DB utilities (schema application, inhabited-body
query, body-def loader, grid constants) out of the soon-to-be-retired
generate_atlas.py into a dedicated atlas_common.py with no dependency on
geometry-production code. Repoint the surviving build-time importers
(import_heightmaps, import_province_boundaries) at the new module.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>