feat: add RollyPay payment provider to cabinet frontend

- Payment method label and icon (green gradient, RP)
- Admin settings tree entry for ROLLYPAY category
- Locale strings and descriptions for ru, en, zh, fa

src/locales/fa.json

@@ -1618,6 +1618,7 @@
         "payments_riopay": "RioPay",
         "payments_severpay": "SeverPay",
         "payments_paypear": "PayPear",
+        "payments_rollypay": "RollyPay",
         "subs_core": "هسته",
         "subs_trial": "آزمایشی",
         "subs_pricing": "قیمت‌گذاری",