feat: add admin traffic usage page with TanStack Table

Add AdminTrafficUsage page showing per-user traffic statistics by node
with period filtering (1/3/7/14/30d), server-side sorting, search,
pagination, and CSV export. Uses @tanstack/react-table with manual
sorting and dynamic node columns.

src/locales/en.json

@@ -761,7 +761,8 @@
       "campaigns": "Campaigns",
       "promoOffers": "Promo Offers",
       "promocodes": "Promo Codes",
-      "promoGroups": "Discount Groups"
+      "promoGroups": "Discount Groups",
+      "trafficUsage": "Traffic Usage"
     },
     "panel": {
       "title": "Admin Panel",
@@ -783,7 +784,26 @@
       "campaignsDesc": "Advertising campaigns",
       "promoOffersDesc": "Personal discounts",
       "promocodesDesc": "Manage promo codes",
-      "promoGroupsDesc": "Discount groups for users"
+      "promoGroupsDesc": "Discount groups for users",
+      "trafficUsageDesc": "Per-user traffic by nodes"
+    },
+    "trafficUsage": {
+      "title": "Traffic Usage",
+      "subtitle": "Per-user traffic statistics by nodes",
+      "period": "Period",
+      "days": "d",
+      "exportCsv": "Export CSV",
+      "exportSuccess": "CSV sent to your Telegram",
+      "exportError": "Failed to export",
+      "user": "User",
+      "tariff": "Tariff",
+      "devices": "Devices",
+      "trafficLimit": "Limit",
+      "total": "Total",
+      "noData": "No traffic data",
+      "loading": "Loading traffic data...",
+      "noTariff": "\u2014",
+      "search": "Search by name or username"
     },
     "emailTemplates": {
       "title": "Email Templates",

src/locales/fa.json

@@ -642,7 +642,8 @@
       "promocodes": "کدهای تخفیف",
       "promoGroups": "گروه‌های تخفیف",
       "remnawave": "RemnaWave",
-      "users": "کاربران"
+      "users": "کاربران",
+      "trafficUsage": "مصرف ترافیک"
     },
     "panel": {
       "title": "پنل مدیریت",
@@ -664,7 +665,26 @@
       "promocodesDesc": "مدیریت کدهای تخفیف",
       "promoGroupsDesc": "گروه‌های تخفیف برای کاربران",
       "remnawaveDesc": "مدیریت پنل و آمار",
-      "usersDesc": "مدیریت کاربران ربات"
+      "usersDesc": "مدیریت کاربران ربات",
+      "trafficUsageDesc": "ترافیک هر کاربر بر اساس نود"
+    },
+    "trafficUsage": {
+      "title": "مصرف ترافیک",
+      "subtitle": "آمار ترافیک کاربران بر اساس نودها",
+      "period": "دوره",
+      "days": "روز",
+      "exportCsv": "خروجی CSV",
+      "exportSuccess": "CSV به تلگرام شما ارسال شد",
+      "exportError": "خطا در خروجی",
+      "user": "کاربر",
+      "tariff": "تعرفه",
+      "devices": "دستگاه‌ها",
+      "trafficLimit": "محدودیت",
+      "total": "کل",
+      "noData": "داده ترافیکی موجود نیست",
+      "loading": "در حال بارگذاری داده‌های ترافیک...",
+      "noTariff": "\u2014",
+      "search": "جستجو بر اساس نام یا نام کاربری"
     },
     "emailTemplates": {
       "title": "قالب‌های ایمیل",

src/locales/ru.json

@@ -782,7 +782,8 @@
       "campaigns": "Кампании",
       "promoOffers": "Промопредложения",
       "promocodes": "Промокоды",
-      "promoGroups": "Группы скидок"
+      "promoGroups": "Группы скидок",
+      "trafficUsage": "Расход трафика"
     },
     "panel": {
       "title": "Панель администратора",
@@ -804,7 +805,26 @@
       "campaignsDesc": "Рекламные кампании",
       "promoOffersDesc": "Персональные скидки",
       "promocodesDesc": "Управление промокодами",
-      "promoGroupsDesc": "Группы скидок для пользователей"
+      "promoGroupsDesc": "Группы скидок для пользователей",
+      "trafficUsageDesc": "Трафик пользователей по нодам"
+    },
+    "trafficUsage": {
+      "title": "Расход трафика",
+      "subtitle": "Статистика трафика по пользователям и нодам",
+      "period": "Период",
+      "days": "д",
+      "exportCsv": "Экспорт CSV",
+      "exportSuccess": "CSV отправлен в ваш Telegram",
+      "exportError": "Ошибка экспорта",
+      "user": "Пользователь",
+      "tariff": "Тариф",
+      "devices": "Устройства",
+      "trafficLimit": "Лимит",
+      "total": "Всего",
+      "noData": "Нет данных о трафике",
+      "loading": "Загрузка данных о трафике...",
+      "noTariff": "\u2014",
+      "search": "Поиск по имени или юзернейму"
     },
     "emailTemplates": {
       "title": "Email-шаблоны",

src/locales/zh.json

@@ -642,7 +642,8 @@
       "promocodes": "促销码",
       "promoGroups": "折扣组",
       "remnawave": "RemnaWave",
-      "users": "用户"
+      "users": "用户",
+      "trafficUsage": "流量使用"
     },
     "panel": {
       "title": "管理面板",
@@ -664,7 +665,26 @@
       "promocodesDesc": "管理促销码",
       "promoGroupsDesc": "用户折扣组",
       "remnawaveDesc": "面板管理和统计",
-      "usersDesc": "管理机器人用户"
+      "usersDesc": "管理机器人用户",
+      "trafficUsageDesc": "按节点统计用户流量"
+    },
+    "trafficUsage": {
+      "title": "流量使用",
+      "subtitle": "按节点的用户流量统计",
+      "period": "周期",
+      "days": "天",
+      "exportCsv": "导出CSV",
+      "exportSuccess": "CSV已发送到您的Telegram",
+      "exportError": "导出失败",
+      "user": "用户",
+      "tariff": "套餐",
+      "devices": "设备",
+      "trafficLimit": "限制",
+      "total": "总计",
+      "noData": "无流量数据",
+      "loading": "正在加载流量数据...",
+      "noTariff": "\u2014",
+      "search": "按名称或用户名搜索"
     },
     "paymentMethods": {
       "title": "支付方法",