#89 UI: Tenant Management Page (System Admin)

Create Tenant Management page for system admins. Component: api/ui/templates/components/admin_tenants/ Files: - admin_tenants.html - admin_tenants.css - admin_tenants.js URL: #/admin/tenants (system_admin only) Features: - Tenant List Table: - Columns: Name, Display Name, Status, Users, Workflows, Created, Last Activity - Status badges (active, suspended, pending_deletion) - Search by name - Filter by status - Sort options - Create Tenant Modal: - Name input (unique) - Display name - Admin email - Initial settings - Tenant Detail Panel: - Overview stats - User list (paginated) - Resource usage - Audit log excerpt - Tenant Actions: - Edit settings - Suspend/Activate - Delete (soft delete) - Hard delete (confirmation required) - Tenant Health: - Storage usage - API usage - Active workflows With ultra attention to details and correctness. Before closing: write comment summarizing implementation with screenshot.