feat(admin): wave metrics split by model version (M6)

The library page compares listen-through, early-skip and like rates per
impression model version, so v1 and the trained ranker can be compared online.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/i18n/locales/ru/admin.json

@@ -158,7 +158,9 @@
     "wave_sessions": "Сессий",
     "wave_listen": "Дослушано ≥ 50%",
     "wave_early_skip": "Ранние скипы",
-    "wave_likes": "Лайков на 100"
+    "wave_likes": "Лайков на 100",
+    "wave_model": "Версия модели",
+    "wave_by_model": "Сравнение версий модели волны"
   },
   "write_template": {
     "title": "Приём загрузок и шаблон пути",