Furni imports can now choose whether to translate (per import) and which
languages to build, instead of always rebuilding all 13 FurnitureData_<lang>
files. The studio header also has a global switch that persists the
furnidata_translate_enabled setting, seeding the per-import default.
- Move /admin/import/* tools under /admin/studio/* and add studio nav, layout and tabs
- Add shared catalog maintenance panel plus a /admin/studio/maintenance tab
- Make furnidata reconciliation overwrite conflicting entries with the
DB-authoritative items_base classname/id (surfaced via fixedConflicts)
- Add furnidata_translate_enabled setting to skip the heavy localized
furnidata build during import (manual build-languages still forces it)
- Update staff smoke contract test for the studio hub
openhands