feat(bookings): implement ticket receipts and seat sharing system

Add receipt tokens and booking_seats table to track individual tickets
Create receipt and seat view pages with QR code generation

server/utils/bookings.ts

@@ -63,6 +63,29 @@ export function buildBookingMessage(booking: PublicBooking, confirmationUrl: str
   ].join('\n')
 }
 
+export function parseSeatShareInput(body: {
+  shared?: boolean
+  recipientName?: string | null
+  recipientPhone?: string | null
+}) {
+  const shared = body.shared
+  const recipientName = normalizeFullName(body.recipientName || '')
+  const recipientPhone = normalizePhoneNumber(body.recipientPhone || '')
+
+  assertBadRequest(typeof shared === 'boolean', 'Shared flag is required')
+
+  if (shared) {
+    assertBadRequest(!recipientName || hasValidFullName(recipientName), 'Recipient name must be at least 2 characters')
+    assertBadRequest(!recipientPhone || isValidPhoneNumber(recipientPhone), 'Recipient phone number must contain 8 to 15 digits')
+  }
+
+  return {
+    shared,
+    recipientName: recipientName || null,
+    recipientPhone: recipientPhone || null
+  }
+}
+
 export function parseBookingCapacityInput(body: {
   totalTables?: number | string | null
 }): Pick<BookingCapacitySettings, 'totalTables'> {