Legacy Office formats need an explicit conversion policy before they can be
opened for editing.
Keep the mapping small and configuration-driven so the backend only converts
formats intentionally forced by the WOPI client.
Drive needs a server-side path to convert legacy Office files without opening an
interactive editor session.
Use OnlyOffice's conversion API as the first supported provider for the POC.
Issue #412 asks for a way to download an entire folder. Add a
GET /items/<id>/export/ action that streams a recursive ZIP archive of
the folder, preserving the directory hierarchy and skipping soft-deleted
or not-yet-uploaded descendants.
Introduce a new "export" entry in Item.get_abilities, true only for
folders the user can read. Will be the gate for the upcoming recursive
folder export endpoint.
The _deprecated_numchild and _deprecated_numchild_folder fields were
kept temporarily to preserve the underlying columns during the tree
model transition. The columns are no longer read or written, so the
fields and their columns can now be removed.