feat(bookings): add internal remark field to bookings

Add a remark column to the bookings table for management-only notes.
Include UI to view and edit remarks directly from the bookings list.
Create API endpoint and database queries to support remark updates.

server/utils/bookings.ts

@@ -39,6 +39,18 @@ export function parseCreateBookingInput(body: {
   }
 }
 
+export function parseBookingRemarkInput(body: {
+  remark?: string | null
+}) {
+  const remark = typeof body.remark === 'string' ? body.remark.trim() : ''
+
+  assertBadRequest(remark.length <= 1000, 'Remark must be 1,000 characters or fewer')
+
+  return {
+    remark: remark || null
+  }
+}
+
 export function buildBookingMessage(booking: PublicBooking, confirmationUrl: string) {
   return [
     `I'd like to book tickets for the ${booking.event.title}.`,