feat: add node/status filters and custom date range to traffic page

- Add NodeFilter component with flag emojis and checkbox dropdown
- Add StatusFilter component with colored status dots
- Add custom date range picker (calendar toggle, from/to date inputs)
- Wire all filters to backend params (nodes, statuses, start_date, end_date)
- CSV export passes all active filters and date range
- Add displayNodes memo for table column filtering
- Add i18n keys for nodes, statuses, dates in ru/en/zh/fa

src/locales/ru.json

@@ -825,7 +825,18 @@
       "loading": "Загрузка данных о трафике...",
       "noTariff": "\u2014",
       "search": "Поиск по имени или юзернейму",
-      "allTariffs": "Все тарифы"
+      "allTariffs": "Все тарифы",
+      "nodes": "Ноды",
+      "allNodes": "Все ноды",
+      "status": "Статус",
+      "allStatuses": "Все",
+      "statusActive": "Активная",
+      "statusTrial": "Пробная",
+      "statusExpired": "Истекла",
+      "statusDisabled": "Отключена",
+      "customDates": "Выбрать даты",
+      "dateFrom": "От",
+      "dateTo": "До"
     },
     "emailTemplates": {
       "title": "Email-шаблоны",