Build an AI gym management system for boutique gyms and studios. Features: 1) Member profiles with plan type, billing status, emergency contact, and trainer notes. 2) Recurring membership billing through Stripe with automatic dunning emails for failed cards and a self-service plan change page. 3) Class and appointment scheduling with capacity caps, waitlists, and per-instructor calendars. 4) Check-in tracking via a PIN or QR code kiosk view at the front desk. 5) Trainer management with class assignments, payroll-ready hour reports, and substitute request flows. 6) AI-drafted retention messages triggered by attendance patterns, such as a 2 week absence win-back text or a 50 session milestone email, queued for staff approval before sending. 7) A churn-risk dashboard flagging members with declining attendance or lapsed payments. 8) Revenue and attendance reports by class, plan, and month. 9) A member self-service portal for booking, cancellations, and stored payment updates. Skip door-access hardware integration in v1 and use the check-in kiosk instead.