Warren
837ffa923d
Implement SMB Previous versions (shadow copy) at VFS layer
- Add VfsPreviousVersion struct (snapshot_name, gmt_token, created, size)
- Add VfsBackend methods:
- list_previous_versions() - enumerate snapshot versions
- open_previous_version() - open file from snapshot by GMT token
- restore_previous_version() - restore file from snapshot
- LocalFs implementation:
- systemtime_to_gmt_token() - convert SystemTime to @GMT-YYYY.MM.DD-HH.MM.SS
- scan .snapshots directory for matching versions
- use existing restore_snapshot() for restoration
- Foundation for SMB shadow copy (@GMT- token support)
All 229 tests pass.