feat: add UI menu

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+---
+
+## [0.3.0] - 2026-03-18
+
+### Added
+- CLI menu (`update-manager-ui.sh`)
+- Interactive host selection
+- Basic UI navigation with dialog
+
+### Changed
+- Project renamed from lanx-update → update-manager
+- Improved structure in /opt/update-manager
+
+### Fixed
+- Symlink issues in setup
+- Path handling for config and hosts
+
+---
+
+## [0.2.0] - 2026-03-18
+
+### Added
+- SSH-based update check across hosts
+- hosts.conf support
+- Config file support (`/etc/update-manager.conf`)
+
+---
+
+## [0.1.0] - 2026-03-17
+
+### Added
+- Initial script
+- Basic apt update check
+
+