- Updated project version in `Gamepad Mapping.csproj` to 2.1.0-beta.
- Expanded `CHANGELOG.md` to document new features including GitHub-based self-update pipeline, installer execution flow, and download progress models.
- Integrated update workflow into UI components and improved localization in `Strings.resx`.
- Updated `README.md` and `README_zh.md` to reflect built-in self-update capabilities and installation processes.