feat(difs): Assemble exclusive Objectstore DIFs from blobs - #121065
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Stacked on: #121064.
Split DIF creation into two explicit storage paths:
create_dif_from_fileretains a legacyFileand optionally dual-writes to Objectstore, whilecreate_dif_from_fileobjcreates an Objectstore-only DIF from a file-like object.ZIP uploads select the path from the exclusive-write flag; legacy File-backed callers continue to use
create_dif_from_file. With exclusive write enabled, chunked DIF uploads assemble their blobs into a disk-backed temporary file for validation and Objectstore upload, without creatingFileorFileBlobIndexrows. Flag-off and dual-write uploads retain the legacyFileassembly path.