Remove the Operator HUD layout

Display > HUD > Layout and the set_hud voice action now offer Tactical,
Minimal and Cyber. The Operator option, its CSS and its QA coverage are
removed, and the unused "Operator" translations are pruned.

Share-link codes are append-only, so operator keeps its hudVariant code.
A link, scene or saved state that names it restores the default Tactical
layout. The voice schema pins keep their legacy digests by restoring the
retired value before comparing; the full-payload digest is re-derived.

src/i18n/locales/ru.json

@@ -777,7 +777,6 @@
   "Fade": "Затухание",
   "Outside": "Снаружи",
   "Tactical": "Тактический",
-  "Operator": "Операторский",
   "Minimal": "Минимальный",
   "HUD layout": "Макет HUD",
   "Layout": "Макет",