Managed Document Vault and Dedupe

QiLife eventually replaces Paperless-style intake.

Doctrine

QiLife is dup-allergic. Every incoming file must be hashed.
Exact duplicates should not create duplicate blobs. Near duplicates should be flagged for review.
Files should be stored as managed file objects.
Documents are meaning/context records linked to file objects.
Support document versions.
File deletion should be safe, logged, and restorable before purge.