Rendivo Backend (Express + MySQL)

1. Copy .env.example to .env and adjust values if needed.
2. Install dependencies: npm install.
3. Start the API: npm start (or npm run dev with nodemon).

Key endpoints:

• POST /api/auth/register — create a customer account.
• POST /api/auth/login — sign in and receive a JWT.
• GET /api/businesses — list active businesses.
• GET /api/businesses/:id/services — list active services for a business.
• GET /api/appointments/me — authenticated; fetch customer appointments.
• POST /api/appointments — authenticated; create an appointment (pass serviceIds, appointmentDate, startTime, endTime, optional notes, staffId).
• PATCH /api/appointments/:id/cancel — authenticated; cancel own appointment.
• PATCH /api/appointments/:id/reschedule — authenticated; update date/time.
• PATCH /api/appointments/:id/notes — authenticated; update notes.