fix(admin-ui): wire require_force into the refund dialog

AdminRefundDialog already implements a `requireForce` prop that renders the
force checkbox and blocks submit until it is checked, but AdminOrdersView
never consumed `require_force` from the refund response nor bound the prop,
so the checkbox could never render. Admins hitting a require-force case (for
example a user who spent their balance after requesting the refund) only saw
an error toast and had no way to complete the refund from the UI.

Keep the dialog open when the backend answers `require_force`, surface the
checkbox and the backend warning, and reset the flag whenever the dialog is
opened or closed.

Verified with `npm run typecheck` (vue-tsc --noEmit, clean).

frontend/src/views/admin/orders/AdminOrdersView.vue

@@ -111,7 +111,7 @@
       </div>
     </BaseDialog>
 
-    <AdminRefundDialog :show="showRefundDialog" :order="selectedOrder" :submitting="refundSubmitting" @confirm="handleRefund" @cancel="showRefundDialog = false" />
+    <AdminRefundDialog :show="showRefundDialog" :order="selectedOrder" :submitting="refundSubmitting" :require-force="refundRequireForce" :warning="refundWarning" @confirm="handleRefund" @cancel="closeRefundDialog" />
   </AppLayout>
 </template>
 
@@ -153,6 +153,8 @@ const selectedOrder = ref<PaymentOrder | null>(null)
 const showDetailDialog = ref(false)
 const showRefundDialog = ref(false)
 const refundSubmitting = ref(false)
+const refundRequireForce = ref(false)
+const refundWarning = ref('')
 const refundQueryingIds = ref(new Set<number>())
 const orderAuditLogs = ref<AuditLog[]>([])
 const creditedAmountSymbol = currencySymbol('USD')
@@ -235,7 +237,18 @@ async function handleRetryOrder(order: PaymentOrder) {
   catch (err: unknown) { appStore.showError(extractI18nErrorMessage(err, t, 'payment.errors', t('common.error'))) }
 }
 
-function openRefundDialog(order: PaymentOrder) { selectedOrder.value = order; showRefundDialog.value = true }
+function openRefundDialog(order: PaymentOrder) {
+  selectedOrder.value = order
+  refundRequireForce.value = false
+  refundWarning.value = ''
+  showRefundDialog.value = true
+}
+
+function closeRefundDialog() {
+  showRefundDialog.value = false
+  refundRequireForce.value = false
+  refundWarning.value = ''
+}
 
 function isRefundPendingWarning(warning: string | undefined): boolean {
   return /pending|处理中|待/.test(String(warning || '').toLowerCase())
@@ -248,16 +261,24 @@ async function handleRefund(data: { amount: number; reason: string; deduct_balan
     const res = await adminPaymentAPI.refundOrder(selectedOrder.value.id, { amount: data.amount, reason: data.reason, deduct_balance: data.deduct_balance, force: data.force })
     if (res.data.success) {
       appStore.showSuccess(t('payment.admin.refundSuccess'))
-      showRefundDialog.value = false
+      closeRefundDialog()
       loadOrders()
       return
     }
     if (isRefundPendingWarning(res.data.warning)) {
       appStore.showSuccess(t('payment.admin.refundPending'))
-      showRefundDialog.value = false
+      closeRefundDialog()
       loadOrders()
       return
     }
+    if (res.data.require_force) {
+      // Backend needs an explicit force confirmation (e.g. the user spent their
+      // balance after requesting the refund). Keep the dialog open and surface
+      // the force checkbox instead of dropping the admin back to the list.
+      refundRequireForce.value = true
+      refundWarning.value = res.data.warning || ''
+      return
+    }
     appStore.showError(res.data.warning || t('common.error'))
   } catch (err: unknown) { appStore.showError(extractI18nErrorMessage(err, t, 'payment.errors', t('common.error'))) }
   finally { refundSubmitting.value = false }