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/zh.json

@@ -1656,6 +1656,7 @@
         "payments_riopay": "RioPay",
         "payments_severpay": "SeverPay",
         "payments_paypear": "PayPear",
+        "payments_rollypay": "RollyPay",
         "subs_core": "核心",
         "subs_trial": "试用",
         "subs_pricing": "定价",