- Add platform-specific implementations for Windows, BSD systems
- Create platform-specific disk space checking with proper syscalls
- Add Windows process cleanup using tasklist/taskkill
- Add BSD-specific Statfs_t field handling (F_blocks, F_bavail, F_bsize)
- Support 9/10 target platforms (Linux, Windows, macOS, FreeBSD, OpenBSD)
- Process cleanup now works on all Unix-like systems and Windows
- Phase 2 TUI improvements compatible across platforms
- Created internal/cleanup package for orphaned process management
- KillOrphanedProcesses(): Finds and kills pg_dump, pg_restore, gzip, pigz
- killProcessGroup(): Kills entire process groups (handles pipelines)
- Pass parent context through all TUI operations (backup/restore inherit cancellation)
- Menu cancel now kills all child processes before exit
- Fixed context chain: menu.ctx → backup/restore operations
- No more zombie processes when user quits TUI mid-operation
Context chain:
- signal.NotifyContext in main.go → menu.ctx
- menu.ctx → backup_exec.ctx, restore_exec.ctx
- Child contexts inherit cancellation via context.WithTimeout(parentCtx)
- All exec.CommandContext use proper parent context
Prevents: Orphaned pg_dump/pg_restore eating CPU/disk after TUI quit
