feat(versioning) : add entity versioning frontend with restore flow

- useEntityVersions composable (list, preview, restore API calls)
- EntityVersionList component with auto-refresh after save
- VersionRestoreModal with context-aware messages per entity type
- Integrate into machine, composant, piece, product detail pages
- Add restore action label to historyDisplayUtils
- Show structure slots in composant/piece consultation mode

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/shared/utils/historyDisplayUtils.ts

@@ -12,6 +12,7 @@
 export const historyActionLabel = (action: string): string => {
   if (action === 'create') return 'Création'
   if (action === 'delete') return 'Suppression'
+  if (action === 'restore') return 'Restauration'
   return 'Modification'
 }