feat: add Etoplatezhi payment provider support

- Add etoplatezhi to METHOD_LABELS for stats charts
- Add PaymentMethodIcon case with green gradient SVG
- Add payments_etoplatezhi to admin settings tree
- Add i18n keys in all 4 locales (en, ru, zh, fa)

src/constants/paymentMethods.ts

@@ -18,6 +18,7 @@ export const METHOD_LABELS: Record<string, string> = {
   paypear: 'PayPear',
   rollypay: 'RollyPay',
   aurapay: 'AuraPay',
+  etoplatezhi: 'Etoplatezhi',
   apple_iap: 'Apple In-App Purchase',
   manual: 'Ручное пополнение',
 };