feat(auth): add phone registration support + enterprise register page redesign
- User entity: email nullable, add phone field (nullable unique)
- AuthService/Controller: login/register accept email OR phone
- UserRepository: findByPhone(), findByIdentifier() (auto-detects email vs phone)
- Migration 007: ALTER public.users + all existing tenant schemas to add phone
- Tenant schema template (002): users table now includes phone column
- Register page: enterprise-focused design, email/phone toggle, app download section
- Auth i18n (zh/en): new keys for phone, enterprise messaging, download CTA
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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