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/db-init.ts

@@ -260,6 +260,7 @@ async function initializeDatabase() {
       person_in_charge_id text not null references users(id) on delete restrict,
       person_in_charge_name text not null,
       person_in_charge_phone_number text not null,
+      remark text,
       status text not null default 'pending',
       confirmed_at timestamptz,
       created_at timestamptz not null default now(),
@@ -287,6 +288,11 @@ async function initializeDatabase() {
     add column if not exists ticket_type_id text
   `
 
+  await sql`
+    alter table bookings
+    add column if not exists remark text
+  `
+
   await sql`
     create unique index if not exists bookings_receipt_token_idx
     on bookings (receipt_token)