- Windows: use FILE_FS_FULL_SIZE_INFORMATION_EX on Windows 10 1809+ (Build >= 17763) when calcType != AVAILABLE to get ActualTotalAllocationUnits/ActualAvailableAllocationUnits (ignoring per-user disk quotas). Fall back to legacy FILE_FS_FULL_SIZE_INFORMATION with CallerAvailableAllocationUnits when calcType is AVAILABLE or EX is unavailable.
- Unix-like: respect --disk-calc-type. Use f_bfree for FREE, f_bavail for AVAILABLE (Linux/BSD/SunOS). Haiku currently always uses free_blocks.
- Refactor FFDisk: remove bytesUsed and bytesAvailable; compute used = total - free in disk module.
- Disk module: update custom format (remove `size-available`, add `bytes-used` and `bytes-total`); update JSON output (remove `bytes.available`, `bytes.used`).
- Disk detection: stop computing used in common path; let each platform set bytesFree by chosen semantics.
Fixes#2651
李通洲
f93ffed57a