Backend:
- Enhanced register endpoint to accept companyName for self-service
tenant creation with schema provisioning and admin user setup
- Added TenantInvite entity with token-based invitation system
- Added invite CRUD endpoints to TenantController (create/list/revoke)
- Added public endpoints for invite validation and acceptance
Frontend:
- Created registration page with optional organization name field
- Created invitation acceptance page at /invite/[token]
- Added invite management UI to tenant detail page
- Updated login page with link to registration
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
