refactor: use gopsutil and go-humanize for preflight checks

- Added gopsutil/v3 for cross-platform system metrics
  * Works on Linux, macOS, Windows, BSD
  * Memory detection no longer requires /proc parsing

- Added go-humanize for readable output
  * humanize.Bytes() for memory sizes
  * humanize.Comma() for large numbers

- Improved preflight display with memory usage percentage
- Linux kernel checks (shmmax/shmall) still use /proc for accuracy

bin/README.md

@@ -4,8 +4,8 @@ This directory contains pre-compiled binaries for the DB Backup Tool across mult
 
 ## Build Information
 - **Version**: 3.42.10
-- **Build Time**: 2026-01-14_14:06:01_UTC
-- **Git Commit**: 22a7b9e
+- **Build Time**: 2026-01-14_14:30:57_UTC
+- **Git Commit**: e0cdcb2
 
 ## Recent Updates (v1.1.0)
 - ✅ Fixed TUI progress display with line-by-line output