feat: implement public booking cancellation feature

- Added cancelPublicBooking handler to manage booking cancellations.
- Updated public booking service to include cancellation logic.
- Created cancelPublicBooking schema for input validation.
- Modified public booking confirmation page to allow users to cancel their bookings.
- Enhanced email service to send cancellation confirmation emails.
- Made customerEmail field required in booking schemas and updated related components.
- Updated API client to support cancellation requests.
- Added migration to enforce non-nullable customer_email fields in the database.

apps/frontend/src/lib/api-client.ts

@@ -52,6 +52,7 @@ export const apiClient = {
     getAvailability: api.getAvailability,
     create: api.createPublic,
     getConfirmation: api.getConfirmation,
+    cancelPublic: api.cancelPublic,
   },
   adminBookings: {
     listByComplex: api.listByComplex,