Add attendee count field to booking requests and display it

Updates API schemas and database to include attendee count for bookings, modifies the public request form to accept this new optional field, and displays the attendee count on the booking details.

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lib/db/src/schema/protocol.ts

@@ -94,6 +94,9 @@ export const protocolRoomBookingsTable = pgTable(
     // The requester's organization / entity (الجهة). Optional even for
     // public requests; always null for internal bookings unless set.
     requesterOrg: varchar("requester_org", { length: 300 }),
+    // Expected number of attendees (عدد الحضور). Optional; supplied by the
+    // guest on a public request or by staff on an internal booking.
+    attendeeCount: integer("attendee_count"),
     // Provenance marker. "internal" for bookings created by authenticated
     // protocol staff through the app; "public" for guest requests coming in
     // via the no-login booking-request link. Defaults to "internal" so all