Replace the standalone ExportData console app and hardcoded SeedController
with generic GET /api/catalog/export and POST /api/catalog/import endpoints.
Import uses upsert semantics with per-item error handling, preserving
existing inventory quantities.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add controllers for suppliers, stock items, jobs, cutting tools, and
packing. Refactor MaterialsController to use MaterialService with
dimension-aware CRUD, search, and bulk operations. Extract DTOs into
dedicated files.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
