Enhance billing status handling in PlanContent component

- Integrated billing status query to determine if payment is required for users with active plans.
- Added conditional rendering for a payment notice card, guiding users to the billing page if payment is needed.
- Updated i18n resource files with new translations for payment-related messages, improving user clarity on billing status.

frontend/src/routes/plan.tsx

@@ -13,6 +13,8 @@ import { applyDiscount, resolveDiscountPercent } from '@/shared/lib/pricing'
 import { getMyConfigs } from '@/features/configs/api'
 import { getSupportPricing } from '@/features/support/api'
 import { changePlan, getMyPlanStatus, listPlans } from '@/features/plans/api'
+import { getMyBillingStatus } from '@/features/billing/api'
+import { getDaysRemaining } from '@/features/billing/remaining'
 
 export const Route = createFileRoute('/plan')({ component: PlanPage })
 
@@ -35,6 +37,17 @@ function PlanContent() {
   const statusQuery = useQuery({ queryKey: ['my-plan-status'], queryFn: getMyPlanStatus })
   const pricingQuery = useQuery({ queryKey: ['support-pricing'], queryFn: getSupportPricing })
   const configsQuery = useQuery({ queryKey: ['my-configs'], queryFn: getMyConfigs })
+  const billingStatusQuery = useQuery({ queryKey: ['my-billing-status'], queryFn: getMyBillingStatus })
+
+  // Если оплата включена для роли, но сейчас нет действующего оплаченного периода (ни разу не
+  // платил, либо срок истёк) — не ждём, пока это всплывёт как 403 при попытке создать конфиг:
+  // сразу предлагаем оформить оплату прямо на странице тарифа. Не показываем, если заявка уже
+  // отправлена и ждёт решения админа (activeRequest) — тогда достаточно билинг-страницы.
+  const billingData = billingStatusQuery.data
+  const needsPayment =
+    !!billingData?.billingEnabled &&
+    !billingData.activeRequest &&
+    (!billingData.paidUntil || getDaysRemaining(billingData.paidUntil) <= 0)
 
   const [selection, setSelection] = useState<string>('')
   const [customCount, setCustomCount] = useState('3')
@@ -104,6 +117,19 @@ function PlanContent() {
         <p className="mt-1 text-xs text-muted-foreground">{t('plan.pageHint')}</p>
       </div>
 
+      {needsPayment && (
+        <Card className="border-destructive/50">
+          <CardHeader>
+            <CardTitle className="text-base">{t('plan.paymentRequiredNotice')}</CardTitle>
+          </CardHeader>
+          <CardContent>
+            <Link to="/billing" className="font-medium text-foreground underline underline-offset-2">
+              {t('plan.goToBilling')}
+            </Link>
+          </CardContent>
+        </Card>
+      )}
+
       <div className="flex flex-col gap-3">
         {plansQuery.data?.map((p) => (
           <label
@@ -123,19 +149,28 @@ function PlanContent() {
           </label>
         ))}
 
-        <label className="flex cursor-pointer items-center gap-3 rounded-md border border-border p-3 text-sm has-[:checked]:border-foreground">
-          <input type="radio" name="plan" checked={selection === 'custom'} onChange={() => setSelection('custom')} />
-          <span className="font-medium">{t('plan.custom')}</span>
-          <Input
-            type="number"
-            min={3}
-            className="w-24"
-            value={customCount}
-            onChange={(e) => {
-              setCustomCount(e.target.value)
-              setSelection('custom')
-            }}
-          />
+        <label className="flex cursor-pointer items-center justify-between gap-3 rounded-md border border-border p-3 text-sm has-[:checked]:border-foreground">
+          <span className="flex items-center gap-3">
+            <input type="radio" name="plan" checked={selection === 'custom'} onChange={() => setSelection('custom')} />
+            <span className="font-medium">{t('plan.custom')}</span>
+            <Input
+              type="number"
+              min={3}
+              className="w-24"
+              value={customCount}
+              onChange={(e) => {
+                setCustomCount(e.target.value)
+                setSelection('custom')
+              }}
+            />
+          </span>
+          {selection === 'custom' && (
+            <span className="flex flex-col items-end text-xs text-muted-foreground">
+              <span>{t('plan.perQuarter', { price: priceFor(pricingQuery.data?.pricePerConfigPerQuarter, targetCount, 3) })}</span>
+              <span>{t('plan.perHalfYear', { price: priceFor(pricingQuery.data?.pricePerConfigPerHalfYear, targetCount, 6) })}</span>
+              <span>{t('plan.perYear', { price: priceFor(pricingQuery.data?.pricePerConfigPerYear, targetCount, 12) })}</span>
+            </span>
+          )}
         </label>
         {selection === 'custom' && <p className="text-xs text-muted-foreground">{t('plan.customHint')}</p>}
       </div>

frontend/src/shared/lib/i18n.ts

@@ -117,6 +117,7 @@ const resources = {
         downgradeNotice: 'Новая квота меньше текущего числа конфигов, занимающих место в квоте (включая приостановленные за неуплату) — выберите, какие отозвать:',
         selectExactly: 'Нужно выбрать ровно {{count}} конфиг(ов) для отзыва.',
         topUpCreated: 'Тариф увеличен. Создана доплата за оставшийся оплаченный период.',
+        paymentRequiredNotice: 'Оплата ещё не произведена (или срок истёк) — конфиги недоступны, пока не оформите оплату.',
         goToBilling: 'Перейти к оплате',
         mustSelectConfigs: 'Выберите конфиги для отзыва.',
         perQuarter: '3 мес: {{price}}',
@@ -708,6 +709,7 @@ const resources = {
         downgradeNotice: 'The new quota is lower than your current number of configs that still count against it (including ones suspended for non-payment) — choose which to revoke:',
         selectExactly: 'Select exactly {{count}} config(s) to revoke.',
         topUpCreated: 'Plan increased. A top-up was created for the remaining paid period.',
+        paymentRequiredNotice: "You haven't paid yet (or your paid period expired) — configs stay unavailable until you complete a payment.",
         goToBilling: 'Go to payment',
         mustSelectConfigs: 'Select configs to revoke.',
         perQuarter: '3 months: {{price}}',