49fcd5e63c
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Adds the first increment of snapshot transfer: - SnapshotPortable engine: package a snapshot into a portable .msbsnap (zip of manifest.json + snapshot.json + sha256), and ingest one back (from a zip upload or an inline payload) by materialising a local snapshot record. - Admin: per-row 'Download portable snapshot' + an Import modal (upload .msbsnap) on the Snapshots page. - API: POST /snapshot/inject — master pushes a snapshot payload into a slave's Web Services API; gated by a new 'Allow Snapshot Injection' option. Route added to the webservices plugin. - Restore engine: new 'create' mode (skip existing, insert only new) and mode-name normalisation (overwrite->replace, create, duplicate). The 'duplicate' (insert-as-new-with-remapped-IDs) mode returns a clear 'not yet available' — deferred to a dedicated, tested pass. - Options: 'Snapshot Transfer' fieldset — default conflict mode + allow-inject toggle. Language keys added (en-GB fallback). Reuses the existing mokosuitebackup.snapshot.manage ACL. NOTE: untested end-to-end (no dev build this session) — verify download/import/inject on a dev build. Refs #237 Claude-Session: https://claude.ai/code/session_01WbGBN9VyRK61zczYWcCQ2i