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/en.json

@@ -804,7 +804,18 @@
       "loading": "Loading traffic data...",
       "noTariff": "\u2014",
       "search": "Search by name or username",
-      "allTariffs": "All tariffs"
+      "allTariffs": "All tariffs",
+      "nodes": "Nodes",
+      "allNodes": "All nodes",
+      "status": "Status",
+      "allStatuses": "All",
+      "statusActive": "Active",
+      "statusTrial": "Trial",
+      "statusExpired": "Expired",
+      "statusDisabled": "Disabled",
+      "customDates": "Custom dates",
+      "dateFrom": "From",
+      "dateTo": "To"
     },
     "emailTemplates": {
       "title": "Email Templates",