fix: merge general improvements from release branch

Backend:
- gateway_handler: pass subject.UserID instead of int64(0) for user-level routing
- setting_handler: add missing BalanceLowNotifyRechargeURL to UpdateSettings response
- openai_gateway_service: use applyAccountStatsCost for account stats pricing integration
- embed_on: add local file override (data/public/) for embedded frontend assets

Frontend:
- useTableSelection: add batchUpdate method for batch operations
- AccountsView: virtual scrolling params, Set-based isSelected, swipe virtualization
- ProxiesView: add batchUpdate to selection and swipe-select
- BulkEditAccountModal: fix submit handler to prevent event object as argument
- SettingsView: move payload construction outside try block
- i18n: add general translation keys (saved, deleted, view, validation, allowUserRefund)
- api/client: reorder error fields for consistency
- stores/payment: clarify pollOrderStatus JSDoc

frontend/src/views/admin/AccountsView.vue

@@ -144,6 +144,7 @@
         <AccountBulkActionsBar :selected-ids="selIds" @delete="handleBulkDelete" @reset-status="handleBulkResetStatus" @refresh-token="handleBulkRefreshToken" @edit="showBulkEdit = true" @clear="clearSelection" @select-page="selectPage" @toggle-schedulable="handleBulkToggleSchedulable" />
         <div ref="accountTableRef" class="flex min-h-0 flex-1 flex-col overflow-hidden">
         <DataTable
+          ref="dataTableRef"
           :columns="cols"
           :data="accounts"
           :loading="loading"
@@ -153,6 +154,8 @@
           default-sort-key="name"
           default-sort-order="asc"
           :sort-storage-key="ACCOUNT_SORT_STORAGE_KEY"
+          :estimate-row-height="72"
+          :overscan="5"
         >
           <template #header-select>
             <input
@@ -164,7 +167,7 @@
             />
           </template>
           <template #cell-select="{ row }">
-            <input type="checkbox" :checked="selIds.includes(row.id)" @change="toggleSel(row.id)" class="rounded border-gray-300 text-primary-600 focus:ring-primary-500" />
+            <input type="checkbox" :checked="isSelected(row.id)" @change="toggleSel(row.id)" class="rounded border-gray-300 text-primary-600 focus:ring-primary-500" />
           </template>
           <template #cell-name="{ row, value }">
             <div class="flex flex-col">
@@ -197,7 +200,9 @@
             <AccountCapacityCell :account="row" />
           </template>
           <template #cell-status="{ row }">
-            <AccountStatusIndicator :account="row" @show-temp-unsched="handleShowTempUnsched" />
+            <div class="flex items-center gap-1.5">
+              <AccountStatusIndicator :account="row" @show-temp-unsched="handleShowTempUnsched" />
+            </div>
           </template>
           <template #cell-schedulable="{ row }">
             <button @click="handleToggleSchedulable(row)" :disabled="togglingSchedulable === row.id" class="relative inline-flex h-5 w-9 flex-shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors duration-200 ease-in-out focus:outline-none focus:ring-2 focus:ring-primary-500 focus:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 dark:focus:ring-offset-dark-800" :class="[row.schedulable ? 'bg-primary-500 hover:bg-primary-600' : 'bg-gray-200 hover:bg-gray-300 dark:bg-dark-600 dark:hover:bg-dark-500']" :title="row.schedulable ? t('admin.accounts.schedulableEnabled') : t('admin.accounts.schedulableDisabled')">
@@ -313,7 +318,7 @@ import { useAppStore } from '@/stores/app'
 import { useAuthStore } from '@/stores/auth'
 import { adminAPI } from '@/api/admin'
 import { useTableLoader } from '@/composables/useTableLoader'
-import { useSwipeSelect } from '@/composables/useSwipeSelect'
+import { useSwipeSelect, type SwipeSelectVirtualContext } from '@/composables/useSwipeSelect'
 import { useTableSelection } from '@/composables/useTableSelection'
 import AppLayout from '@/components/layout/AppLayout.vue'
 import TablePageLayout from '@/components/layout/TablePageLayout.vue'
@@ -351,6 +356,7 @@ const authStore = useAuthStore()
 const proxies = ref<AccountProxy[]>([])
 const groups = ref<AdminGroup[]>([])
 const accountTableRef = ref<HTMLElement | null>(null)
+const dataTableRef = ref<InstanceType<typeof DataTable> | null>(null)
 const selPlatforms = computed<AccountPlatform[]>(() => {
   const platforms = new Set(
     accounts.value
@@ -650,17 +656,25 @@ const {
   clear: clearSelection,
   removeMany: removeSelectedAccounts,
   toggleVisible,
-  selectVisible: selectPage
+  selectVisible: selectPage,
+  batchUpdate
 } = useTableSelection<Account>({
   rows: accounts,
   getId: (account) => account.id
 })
 
+const swipeVirtualContext: SwipeSelectVirtualContext = {
+  getVirtualizer: () => dataTableRef.value?.virtualizer ?? null,
+  getSortedData: () => dataTableRef.value?.sortedData ?? accounts.value,
+  getRowId: (row: any) => row.id,
+}
+
 useSwipeSelect(accountTableRef, {
   isSelected,
   select,
-  deselect
-})
+  deselect,
+  batchUpdate
+}, swipeVirtualContext)
 
 const resetAutoRefreshCache = () => {
   autoRefreshETag.value = null

frontend/src/views/admin/ProxiesView.vue

@@ -985,7 +985,8 @@ const {
   deselect,
   clear: clearSelectedProxies,
   removeMany: removeSelectedProxies,
-  toggleVisible
+  toggleVisible,
+  batchUpdate
 } = useTableSelection<Proxy>({
   rows: proxies,
   getId: (proxy) => proxy.id
@@ -993,7 +994,8 @@ const {
 useSwipeSelect(proxyTableRef, {
   isSelected,
   select,
-  deselect
+  deselect,
+  batchUpdate
 })
 const accountsProxy = ref<Proxy | null>(null)
 const proxyAccounts = ref<ProxyAccountSummary[]>([])

frontend/src/views/admin/SettingsView.vue

@@ -4116,12 +4116,13 @@ async function handleToggleField(provider: ProviderInstance, field: 'enabled' |
   if (field === 'enabled') newValue = !provider.enabled
   else if (field === 'refund_enabled') newValue = !provider.refund_enabled
   else newValue = !provider.allow_user_refund
+
+  const payload: Record<string, boolean> = { [field]: newValue }
+  // Cascade: turning off refund_enabled also turns off allow_user_refund
+  if (field === 'refund_enabled' && !newValue) {
+    payload.allow_user_refund = false
+  }
   try {
-    const payload: Record<string, boolean> = { [field]: newValue }
-    // Cascade: turning off refund_enabled also disables allow_user_refund
-    if (field === 'refund_enabled' && !newValue) {
-      payload.allow_user_refund = false
-    }
     await adminAPI.payment.updateProvider(provider.id, payload)
     if (field === 'enabled') provider.enabled = newValue
     else if (field === 'refund_enabled') {