feat(modify): commercial solutions keyword options for MOVE, COPY, FILLET, CHAMFER, OFFSET

MOVE: Displacement, Enter at the second point uses the base as the vector.
COPY: Displacement, mOde (Single/Multiple), Undo of the last copy.
FILLET: Undo of the last fillet (the command refreshes its entity cache
through the new CadCommand::on_document_undone hook after the host undoes
the document step). CHAMFER: Multiple and Undo. OFFSET: Erase (the offset
replaces its source), Layer (Current/Source), Undo, Exit.
POLY3D, TRACE, MIRROR and MEASUREGEOM expose the keywords they already
accepted as options, so the context menu and option buttons list them.

The pinned prompt now keeps informational bracket groups such as
"[3 objects]" and only drops real option listings when the buttons take over.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

locales/ru-RU/opencadstudio.ftl

@@ -246,6 +246,7 @@ command-move =
            *[many] { $count } объектов
         }]:
     .target = MOVE  Укажите точку назначения  [база { $x },{ $y }]:
+    .displacement = MOVE  Укажите перемещение:
 
 command-copy =
     .array-count = COPY  Введите число элементов массива:
@@ -262,6 +263,8 @@ command-copy =
             [few] создано { $count } копии
            *[many] создано { $count } копий
         } | Массив | Enter=готово | база { $x },{ $y }]:
+    .displacement = COPY  Укажите перемещение:
+    .mode = COPY  Задайте режим копирования [Single/Multiple] <Multiple>:
 
 common =
     .jogged-radius = Радиус с изломом