feat: add show_in_gift toggle UI for tariffs in admin panel

Add pill toggle in tariff create/edit form and purple gift badge
in tariff list. Includes i18n for ru, en, zh, fa locales.

src/locales/en.json

@@ -2044,6 +2044,9 @@
       "statusTitle": "Tariff Status",
       "isActiveLabel": "Active",
       "isActiveHint": "Inactive tariffs are not shown to users",
+      "showInGiftLabel": "Show in gifts",
+      "showInGiftHint": "Tariff will be available for purchase in the gifts section",
+      "giftBadge": "Gift",
       "isTrialLabel": "Trial tariff",
       "isTrialHint": "Available for free trial period",
       "validation": {

src/locales/fa.json

@@ -1705,6 +1705,9 @@
       "statusTitle": "وضعیت تعرفه",
       "isActiveLabel": "فعال",
       "isActiveHint": "تعرفه‌های غیرفعال به کاربران نمایش داده نمی‌شوند",
+      "showInGiftLabel": "نمایش در هدایا",
+      "showInGiftHint": "تعرفه برای خرید در بخش هدایا در دسترس خواهد بود",
+      "giftBadge": "هدیه",
       "isTrialLabel": "تعرفه آزمایشی",
       "isTrialHint": "برای دوره آزمایشی رایگان در دسترس است",
       "validation": {

src/locales/ru.json

@@ -2558,6 +2558,9 @@
       "statusTitle": "Статус тарифа",
       "isActiveLabel": "Активен",
       "isActiveHint": "Неактивные тарифы не отображаются пользователям",
+      "showInGiftLabel": "Видимость в подарках",
+      "showInGiftHint": "Тариф будет доступен для покупки в разделе подарков",
+      "giftBadge": "Подарок",
       "isTrialLabel": "Триальный тариф",
       "isTrialHint": "Доступен для бесплатного пробного периода",
       "validation": {

src/locales/zh.json

@@ -1742,6 +1742,9 @@
       "statusTitle": "套餐状态",
       "isActiveLabel": "已激活",
       "isActiveHint": "未激活的套餐不会显示给用户",
+      "showInGiftLabel": "在礼物中显示",
+      "showInGiftHint": "套餐将在礼物区域中可供购买",
+      "giftBadge": "礼物",
       "isTrialLabel": "试用套餐",
       "isTrialHint": "可用于免费试用期",
       "validation": {