feat(sidebar): move Routing/Outbounds to top-level items with clean URLs

- Move Routing out of the Xray Configs submenu; add Routing and Outbounds
  as top-level sidebar items below Hosts
- Give them their own clean routes (/routing, /outbound) instead of
  /xray#routing and /xray#outbound, registered in the React router and the
  Go SPA shell so direct links and refresh work
- XrayPage derives the active section from the pathname for those routes
- Add menu.routing and menu.outbounds translation keys across all locales

internal/web/translation/ru-RU.json

@@ -111,6 +111,8 @@
     "nodes": "Узлы",
     "settings": "Настройки панели",
     "xray": "Конфигурации Xray",
+    "routing": "Маршрутизация",
+    "outbounds": "Исходящие",
     "apiDocs": "Документация API",
     "logout": "Выход",
     "link": "Управление",