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/pages/admin-orders/ui/AdminOrdersPage.tsx

@@ -318,14 +318,14 @@ export function AdminOrdersPage() {
               </Box>
             )}
 
-            {detail.status === 'DELIVERY_FEE_ADJUSTMENT' && (
+            {detail.status === 'PENDING_PAYMENT' && detail.deliveryFeeLocked === false && (
               <Alert severity="info">
-                Укажите итоговую стоимость доставки (₽). После сохранения заказ получит статус «
-                {orderStatusLabelRu('PENDING_PAYMENT')}», и клиент сможет оплатить с учётом этой суммы.
+                Укажите итоговую стоимость доставки (₽). После сохранения клиент сможет оплатить заказ с учётом этой
+                суммы.
               </Alert>
             )}
 
-            {detail.status === 'DELIVERY_FEE_ADJUSTMENT' && (
+            {detail.status === 'PENDING_PAYMENT' && detail.deliveryFeeLocked === false && (
               <DeliveryFeeAdjustmentForm
                 key={detail.id}
                 orderId={detail.id}

client/src/pages/me/ui/sections/OrderDetailPage.tsx

@@ -207,6 +207,7 @@ export function OrderDetailPage() {
 
         <OrderPaymentSection
           status={order.status}
+          deliveryFeeLocked={order.deliveryFeeLocked}
           paymentMethod={order.paymentMethod ?? null}
           totalCents={order.totalCents}
           isPayPending={payMut.isPending}