- Implement exclude patterns with anchored pattern support:
- Patterns starting with / only match from root of source dir
- Unanchored patterns match anywhere in path
- Support for glob patterns (*.log, .*, **/*.pack)
- Directory patterns skip entire subtrees
- Add gobwas/glob dependency for pattern matching
- Add 16 comprehensive tests for exclude functionality
- Add snapshot prune command to clean orphaned data:
- Removes incomplete snapshots from database
- Cleans orphaned files, chunks, and blobs
- Runs automatically at backup start for consistency
- Add snapshot remove command for deleting snapshots
- Add VAULTIK_AGE_SECRET_KEY environment variable support
- Fix duplicate fx module provider in restore command
- Change snapshot ID format to hostname_YYYY-MM-DDTHH:MM:SSZ
