Warren
9c44bd5929
Implement VFS quota support
- Add VfsQuota and VfsQuotaUsage structs
- Add quota methods to VfsBackend trait:
- set_quota: set space/file limits
- get_quota: retrieve quota settings
- get_quota_usage: current usage stats
- check_quota: pre-write check
- Implement LocalFs quota support:
- Uses .quota metadata file
- JSON storage for quota limits
- Recursive size/file counting
- Hidden files excluded (.quota, .snapshots)
Enables SMB per-share/user quota enforcement.
All 229 tests pass.