fix(hub): add monitor nav link with hub i18n keys

Co-authored-by: Cursor <cursoragent@cursor.com>

assets/i18n/hub-en.json

@@ -17,6 +17,8 @@
   "nav.live_sessions": "Live sessions",
   "nav.education": "Education (demo)",
   "nav.remote": "Remote access",
+  "nav.monitor": "Monitoring",
+  "nav.monitor_desc": "Grafana dashboards — cluster health, alerts, exporters.",
   "nav.short_links": "Short links",
   "nav.short_links_desc": "Mint bearer tokens and shorten URLs for s.f0xx.org.",
   "nav.console_desc": "Issue triage home and workspace cards.",

assets/i18n/hub-ru.json

@@ -17,6 +17,8 @@
   "nav.live_sessions": "Live-сессии",
   "nav.education": "Education (demo)",
   "nav.remote": "Удалённый доступ",
+  "nav.monitor": "Мониторинг",
+  "nav.monitor_desc": "Дашборды Grafana — состояние кластера, алерты, экспортёры.",
   "nav.short_links": "Короткие ссылки",
   "nav.short_links_desc": "Токены и сокращение URL для s.f0xx.org.",
   "nav.console_desc": "Главная консоли и карточки разделов.",