FileORM had tenant_id column but FileEntity domain class was missing it,
causing "column FileORM.tenant_id does not exist" errors on production.
- Add tenantId to FileEntity (constructor, create, fromPersistence)
- Pass tenantId in repository toEntity() mapping
- Add idempotent migration script for files.tenant_id + indexes
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
