v3.42.17: Fix systemd service templates - remove invalid --config flag

- Service templates now use WorkingDirectory for config loading
- Config is read from .dbbackup.conf in /var/lib/dbbackup
- Updated SYSTEMD.md documentation to match actual CLI
- Removed non-existent --config flag from ExecStart

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**: 2026-01-08_09:54:02_UTC
-- **Git Commit**: 83ad62b
+- **Build Time**: 2026-01-08_10:18:23_UTC
+- **Git Commit**: 682510d
 
 ## Recent Updates (v1.1.0)
 - ✅ Fixed TUI progress display with line-by-line output