Refactor client update handling to support nullable parameters for name and expiration

- Updated the `UpdateClientAsync` method in `IXuiPanelGateway` to accept nullable parameters for `name` and `expiresAt`, allowing for more flexible client management without unintended modifications.
- Adjusted the `BlockUserCommandHandler`, `UnblockUserCommandHandler`, and other related command handlers to utilize the new nullable parameters, ensuring that client names remain unchanged during block/unblock operations and that expiration dates are managed correctly.
- Enhanced the billing and configuration handling to reflect the new logic for managing client states based on expiration rather than enabling/disabling, improving reliability in client status management.
- Updated tests to cover the new behavior and ensure proper functionality across the application.

frontend/src/features/configs/CreateConfigDialog.tsx

@@ -1,5 +1,6 @@
 import { useState } from 'react'
 import { useMutation, useQueryClient } from '@tanstack/react-query'
+import { useNavigate } from '@tanstack/react-router'
 import { useTranslation } from 'react-i18next'
 import { Plus } from 'lucide-react'
 import { toast } from '@/shared/ui/toast-store'
@@ -15,6 +16,7 @@ import { createConfig } from './api'
 export function CreateConfigDialog({ inbounds }: { inbounds: AvailableInboundDto[] }) {
   const { t } = useTranslation()
   const queryClient = useQueryClient()
+  const navigate = useNavigate()
   const [open, setOpen] = useState(false)
   const [inboundId, setInboundId] = useState('')
   const [label, setLabel] = useState('')
@@ -29,6 +31,15 @@ export function CreateConfigDialog({ inbounds }: { inbounds: AvailableInboundDto
       setLabel('')
     },
     onError: (error) => {
+      // Safety-net: дашборд уже скрывает эту кнопку при истёкшей оплате (см. dashboard.tsx), но
+      // между открытием страницы и отправкой формы биллинг мог протухнуть — сервер всё равно
+      // проверяет (ConfigErrors.BillingRequired) и на всякий случай отправляем на оплату.
+      if (error instanceof HttpError && error.title === 'Configs.BillingRequired') {
+        toast.error(t('configs.billingRequiredNotice'))
+        setOpen(false)
+        void navigate({ to: '/billing' })
+        return
+      }
       const message =
         error instanceof HttpError && error.status === 409 ? t('configs.quotaExceeded') : t('auth.genericError')
       toast.error(message)

frontend/src/routes/dashboard.tsx

@@ -30,6 +30,12 @@ function ConfigsList() {
   const inboundsQuery = useQuery({ queryKey: ['available-inbounds'], queryFn: listAvailableInbounds })
   const billingStatusQuery = useQuery({ queryKey: ['my-billing-status'], queryFn: getMyBillingStatus })
 
+  // Зеркалит серверную проверку в CreateVpnConfigCommandHandler (ConfigErrors.BillingRequired) —
+  // роль с биллингом и просроченной/неоплаченной подпиской не может создавать новые конфиги.
+  const billing = billingStatusQuery.data
+  const billingBlocksCreate =
+    !!billing?.billingEnabled && (billing.paidUntil == null || new Date(billing.paidUntil) < new Date())
+
   return (
     <div className="mx-auto flex w-full max-w-4xl flex-col gap-6 px-6 py-10">
       <div className="flex items-center justify-between gap-4">
@@ -52,7 +58,14 @@ function ConfigsList() {
             </Link>
           )}
         </div>
-        {inboundsQuery.data?.length === 0 ? (
+        {billingBlocksCreate ? (
+          <div className="flex max-w-xs flex-col items-end gap-1 text-right text-sm">
+            <p className="text-muted-foreground">{t('configs.billingRequiredNotice')}</p>
+            <Link to="/billing" className="font-medium text-foreground underline underline-offset-2">
+              {t('configs.goToBilling')}
+            </Link>
+          </div>
+        ) : inboundsQuery.data?.length === 0 ? (
           <p className="max-w-xs text-right text-sm text-muted-foreground">{t('configs.noInboundsNotice')}</p>
         ) : (
           inboundsQuery.data && <CreateConfigDialog inbounds={inboundsQuery.data} />

frontend/src/shared/lib/i18n.ts

@@ -78,6 +78,8 @@ const resources = {
         location: 'Локация',
         label: 'Метка (необязательно)',
         noInboundsNotice: 'Пока нет доступных локаций для создания конфига. Обратитесь к администратору — необходимо, чтобы он добавил сервер.',
+        billingRequiredNotice: 'Оплата подписки истекла — создание новых конфигов недоступно, пока не продлите доступ.',
+        goToBilling: 'Перейти к оплате',
         created: 'Конфиг создан.',
         quotaExceeded: 'Достигнут лимит конфигов для вашей роли.',
         showLink: 'Ссылка / QR',
@@ -618,6 +620,8 @@ const resources = {
         location: 'Location',
         label: 'Label (optional)',
         noInboundsNotice: 'No locations are available for creating a config yet. Please contact the administrator — a server needs to be added.',
+        billingRequiredNotice: 'Your subscription has expired — creating new configs is unavailable until you renew.',
+        goToBilling: 'Go to payment',
         created: 'Config created.',
         quotaExceeded: 'Config quota reached for your role.',
         showLink: 'Link / QR',