feat: add sub-options UI for landing payment methods + extract components

Add interactive sub-option toggles (Card/SBP/Crypto) to the landing editor
payment method configuration. Extract SortableFeatureItem and
SortableSelectedMethodCard into dedicated component files to reduce
AdminLandingEditor from ~1160 to ~860 lines.

src/locales/en.json

@@ -3192,6 +3192,7 @@
       "selectMethods": "Select available methods",
       "noSystemMethods": "No payment methods configured in the system",
       "methodOrder": "Drag to reorder",
+      "methodSubOptions": "Payment sub-options",
       "loadingPeriods": "Loading...",
       "periodDaySuffix": "d",
       "localeTab": "Language",

src/locales/fa.json

@@ -2918,6 +2918,7 @@
       "selectMethods": "انتخاب روش‌های پرداخت موجود",
       "noSystemMethods": "هیچ روش پرداختی در سیستم پیکربندی نشده است",
       "methodOrder": "برای تغییر ترتیب بکشید",
+      "methodSubOptions": "گزینه‌های فرعی پرداخت",
       "loadingPeriods": "در حال بارگذاری...",
       "periodDaySuffix": "روز",
       "localeTab": "زبان",

src/locales/ru.json

@@ -3747,6 +3747,7 @@
       "selectMethods": "Выберите доступные методы",
       "noSystemMethods": "В системе не настроено ни одного способа оплаты",
       "methodOrder": "Перетащите для изменения порядка",
+      "methodSubOptions": "Варианты оплаты",
       "loadingPeriods": "Загрузка...",
       "periodDaySuffix": "д",
       "localeTab": "Язык",

src/locales/zh.json

@@ -2917,6 +2917,7 @@
       "selectMethods": "选择可用的支付方式",
       "noSystemMethods": "系统中未配置任何支付方式",
       "methodOrder": "拖动以调整顺序",
+      "methodSubOptions": "支付子选项",
       "loadingPeriods": "加载中...",
       "periodDaySuffix": "天",
       "localeTab": "语言",