feat(frontend): multi-node cloning initial implementation (#6216)

* feat(frontend): multinode cloning initial implementation

* fix(frontend): harden live node detection in multinode cloning

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* fix(frontend): add aria label to clone inbound modal

* fix(frontend): shallow copy inbound settings during cloning

* fix(frontend): avoid potential port conflict during testing

* fix(frontend): selection buttons and websocket selection reset fix

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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

internal/web/translation/ru-RU.json

@@ -412,6 +412,8 @@
         "inboundCreateSuccess": "Подключение успешно создано",
         "bulkDeleted": "Удалено подключений: {count}",
         "bulkDeletedMixed": "Удалено: {ok}, не удалось: {failed}",
+        "clonedMany": "Скопировано подключений: {count}",
+        "clonedMixed": "Скопировано: {ok}, не удалось: {failed}",
         "inboundDeleteSuccess": "Подключение успешно удалено",
         "inboundClientAddSuccess": "Клиент(ы) подключения добавлен(ы)",
         "inboundClientDeleteSuccess": "Клиент подключения удалён",