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

app/pages/bookings/index.vue

@@ -276,6 +276,14 @@
                   icon="i-lucide-external-link"
                   size="sm"
                 />
+                <UButton
+                  :to="receiptPath(row.original)"
+                  label="Receipt"
+                  color="neutral"
+                  variant="outline"
+                  icon="i-lucide-receipt"
+                  size="sm"
+                />
               </div>
             </template>
           </UTable>
@@ -408,6 +416,10 @@ function confirmationPath(booking: PublicBooking) {
   return `/confirmation/${booking.confirmationToken}`
 }
 
+function receiptPath(booking: PublicBooking) {
+  return `/receipt/${booking.receiptToken}`
+}
+
 function formatInventoryNumber(value: number | null) {
   return value === null ? 'Not set' : String(value)
 }