- SuperadminLayout with indigo/purple theme
- Tenant management: List, Detail, Create, Edit pages
- SuperadminDashboard with global metrics
- useTenants hook with CRUD operations
- useSuperadminStats hook for dashboard data
- Routes for /superadmin/* paths
- Features: suspend/activate, stats cards, system health
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
