feat: add customer email functionality for booking confirmations

- Implemented email confirmation for admin and public bookings.
- Added customerEmail field to booking schemas and services.
- Created email templates for booking confirmation, cancellation, and no-show notifications.
- Updated booking handlers to send emails upon booking creation and status updates.
- Enhanced frontend forms to capture customer email during booking creation.

apps/backend/prisma/migrations/20260602220943_add_customer_email/migration.sql

@@ -0,0 +1,14 @@
+/*
+  Warnings:
+
+  - You are about to drop the `onboarding_requests` table. If the table is not empty, all the data it contains will be lost.
+
+*/
+-- AlterTable
+ALTER TABLE "court_booking_logs" ADD COLUMN     "customer_email" VARCHAR(254);
+
+-- AlterTable
+ALTER TABLE "court_bookings" ADD COLUMN     "customer_email" VARCHAR(254);
+
+-- DropTable
+DROP TABLE "onboarding_requests";