refactor: simplify order status model — remove DELIVERY_FEE_ADJUSTMENT and PAYMENT_VERIFICATION

- Add deliveryFeeLocked field to Order model
- Remove DELIVERY_FEE_ADJUSTMENT and PAYMENT_VERIFICATION statuses (11→8)
- 3 order paths: delivery+online (locked→unlocked→paid), pickup+online (unlocked→paid), pickup+on_pickup (direct to in_progress)
- Update checkout to use PENDING_PAYMENT + deliveryFeeLocked
- Update payment flow to stay in PENDING_PAYMENT until admin confirms
- Update admin UI to use deliveryFeeLocked instead of status check
- Update client payment UI with new deliveryFeeLocked logic

client/src/shared/constants/order.ts

@@ -8,11 +8,7 @@ export function getAdminNextOrderStatuses(status: string, deliveryType: 'deliver
   switch (status) {
     case 'DRAFT':
       return ['PENDING_PAYMENT', 'CANCELLED']
-    case 'DELIVERY_FEE_ADJUSTMENT':
-      return ['CANCELLED']
     case 'PENDING_PAYMENT':
-      return ['CANCELLED']
-    case 'PAYMENT_VERIFICATION':
       return ['PAID', 'CANCELLED']
     case 'PAID':
       return ['IN_PROGRESS', 'CANCELLED']