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/backend/src/modules/public-booking/handlers/cancel-public-booking.handler.ts

@@ -0,0 +1,55 @@
+import { sseManager } from '@/lib/sse';
+import {
+  PublicBookingServiceError,
+  cancelPublicBooking,
+} from '@/modules/public-booking/services/public-booking.service';
+import { sendBookingCancelled } from '@/services/booking-email.service';
+import type { AppContext } from '@/types/hono';
+import type { CancelPublicBookingInput } from '@repo/api-contract';
+
+type ComplexSlugParams = { complexSlug: string };
+
+export async function cancelPublicBookingHandler(c: AppContext) {
+  const { complexSlug } = c.req.valid('param' as never) as ComplexSlugParams;
+  const payload = c.req.valid('json' as never) as CancelPublicBookingInput;
+
+  try {
+    const booking = await cancelPublicBooking(complexSlug, payload);
+
+    const channel = `complex-${booking.complexId}`;
+    sseManager.emit(
+      channel,
+      JSON.stringify({
+        type: 'booking_cancelled',
+        booking: {
+          bookingCode: booking.bookingCode,
+          courtId: booking.courtId,
+          date: booking.date,
+          startTime: booking.startTime,
+          endTime: booking.endTime,
+        },
+      })
+    );
+
+    void sendBookingCancelled({
+      bookingCode: booking.bookingCode,
+      complexSlug: booking.complexSlug,
+      complexName: booking.complexName,
+      date: booking.date,
+      startTime: booking.startTime,
+      endTime: booking.endTime,
+      courtName: booking.courtName,
+      sportName: booking.sport.name,
+      customerName: booking.customerName,
+      customerEmail: booking.customerEmail,
+    });
+
+    return c.json(booking);
+  } catch (error) {
+    if (error instanceof PublicBookingServiceError) {
+      return c.json({ message: error.message }, error.status);
+    }
+
+    throw error;
+  }
+}

apps/backend/src/modules/public-booking/handlers/create-public-booking.handler.ts

@@ -33,6 +33,7 @@ export async function createPublicBookingHandler(c: AppContext) {
 
     void sendBookingConfirmation({
       bookingCode: booking.bookingCode,
+      complexSlug: booking.complexSlug,
       complexName: booking.complexName,
       date: booking.date,
       startTime: booking.startTime,