#641 Internal Tenant Tools

Implement internal.tenant.* tools for tenant lifecycle operations. Tools: - internal.tenant.create - Create tenant record - internal.tenant.init_rbac - Initialize RBAC roles - internal.tenant.create_admin - Create admin user - internal.tenant.install_apps - Install pre-installed apps - internal.tenant.create_rate_limits - Create default rate limits - internal.tenant.set_schedule - Set TJP schedule for tool - internal.tenant.set_priority_limits - Set priority tiers - internal.tenant.mark_bootstrapped - Update bootstrap_status - internal.tenant.suspend - Suspend tenant - internal.tenant.reactivate - Reactivate tenant - internal.tenant.send_welcome_email - Send welcome email These tools have DurableContext access and are only accessible from internal queue. Parent: #639