- Migration 0090: Drop legacy tenant_isolation policies on companies_old,
company_contacts_old, contacts_old that used app.tenant_id variable.
Create new policies using app.current_tenant_id for crm_api/crm_worker.
- seed_admin.py: Rewrite to use migration engine (crm_migration) for
bootstrap, set tenant context, create Tenant + Role + User + UserTenant.
No longer passes tenant_id as User parameter.
Fixes: 3 legacy app.tenant_id policies found in Gate 2 verification.
Fixes: seed_admin.py incompatible with current User model.