fix(hardlink)!: use (device, inode) pair as deduplication key#347

Copilot wants to merge 4 commits intomasterKSXGitHub/parallel-disk-usage:masterfrom

copilot/check-nlink-hardlink-deduplicationKSXGitHub/parallel-disk-usage:copilot/check-nlink-hardlink-deduplicationCopy head branch name to clipboard