Add initial FabWorksDbContext migration that creates the FormPrograms
table with FK to BomItems. Existing tables (ExportRecords, BomItems,
CutTemplates) are excluded from the migration since they were already
created by ExportDXF's ExportDxfDbContext. Also adds EF Core Design
package to FabWorks.Api for migration tooling support.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
