notification-service does not use Prisma/ORM (raw SQL via TypeORM DataSource).
Dockerfile.service unconditionally copies the prisma/ directory from builder stage,
which fails with 'not found' when the directory doesn't exist.
Adding a .gitkeep placeholder so the COPY succeeds; the subsequent
prisma generate step is skipped because no schema.prisma is present.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
