revert: remove user-facing reset traffic toggle

Reset traffic on tariff switch is an admin-only setting.
Backend handles it via admin settings system (data-driven, no frontend code needed).
Reverted all user-facing toggle UI, API params, types, and translations.

src/locales/en.json

@@ -483,9 +483,7 @@
       "switched": "Tariff switched",
       "notEnoughBalance": "Insufficient balance",
       "dailyPayment": "Daily payment",
-      "dailyChargeDescription": "Charged daily from your balance",
-      "resetTraffic": "Reset traffic",
-      "resetTrafficHint": "Reset used traffic when switching tariff"
+      "dailyChargeDescription": "Charged daily from your balance"
     },
     "switchTraffic": {
       "title": "Change Traffic",

src/locales/fa.json

@@ -378,9 +378,7 @@
       "remainingDays": "روزهای باقی‌مانده",
       "switch": "تغییر",
       "title": "تغییر تعرفه",
-      "upgradeCost": "هزینه ارتقا",
-      "resetTraffic": "بازنشانی ترافیک",
-      "resetTrafficHint": "بازنشانی ترافیک مصرفی هنگام تغییر تعرفه"
+      "upgradeCost": "هزینه ارتقا"
     },
     "promoGroup": {
       "yourGroup": "گروه شما: {{name}}",

src/locales/ru.json

@@ -506,9 +506,7 @@
       "switched": "Тариф изменён",
       "notEnoughBalance": "Недостаточно средств",
       "dailyPayment": "Оплата за день",
-      "dailyChargeDescription": "Списывается ежедневно с баланса",
-      "resetTraffic": "Сбросить трафик",
-      "resetTrafficHint": "Обнулить использованный трафик при смене тарифа"
+      "dailyChargeDescription": "Списывается ежедневно с баланса"
     },
     "switchTraffic": {
       "title": "Изменить трафик",

src/locales/zh.json

@@ -378,9 +378,7 @@
       "remainingDays": "剩余天数",
       "switch": "切换",
       "title": "切换套餐",
-      "upgradeCost": "升级费用",
-      "resetTraffic": "重置流量",
-      "resetTrafficHint": "切换套餐时重置已使用流量"
+      "upgradeCost": "升级费用"
     },
     "promoGroup": {
       "yourGroup": "您的组：{{name}}",