feat(tui): unified cluster backup progress display

- Add combined overall progress bar showing all phases (0-100%)
- Phase 1/3: Backing up Globals (0-15% of overall)
- Phase 2/3: Backing up Databases (15-90% of overall)
- Phase 3/3: Compressing Archive (90-100% of overall)
- Show current database name during backup
- Phase-aware progress tracking with overallPhase, phaseDesc
- Dual progress bars: overall + database count
- Consistent with cluster restore progress display

v3.42.49

bin/README.md

@@ -3,9 +3,9 @@
 This directory contains pre-compiled binaries for the DB Backup Tool across multiple platforms and architectures.
 
 ## Build Information
-- **Version**: 3.42.34
-- **Build Time**: 2026-01-16_13:36:18_UTC
-- **Git Commit**: 838c5b8
+- **Version**: 3.42.48
+- **Build Time**: 2026-01-16_14:32:45_UTC
+- **Git Commit**: 780beaa
 
 ## Recent Updates (v1.1.0)
 - ✅ Fixed TUI progress display with line-by-line output