v3.42.10: Code quality fixes

- Remove deprecated io/ioutil
- Fix os.DirEntry.ModTime() usage
- Remove unused fields and variables
- Fix ineffective assignments
- Fix error string formatting

bin/README.md

@@ -4,8 +4,8 @@ This directory contains pre-compiled binaries for the DB Backup Tool across mult
 
 ## Build Information
 - **Version**: 3.42.1
-- **Build Time**: 2026-01-08_04:54:46_UTC
-- **Git Commit**: 627061c
+- **Build Time**: 2026-01-08_05:03:53_UTC
+- **Git Commit**: 9c65821
 
 ## Recent Updates (v1.1.0)
 - ✅ Fixed TUI progress display with line-by-line output