This platform has a growing desktop and embedded user base, and is fully
supported by Go. The only necessary change is the mapping between
`uname -m` output and GOARCH.
Due to non-technical reasons [1], there is currently no Docker official
image that provides linux/loong64 support, so Docker-based builds are
not included in this commit for now.
[1]: https://github.com/docker-library/official-images/issues/16404
Extract formatVersion() and formatBuildInfo() helper functions to reduce code duplication between printVersion() and statusCmd(). Update git commit default value to "dev" in Makefile for consistency with version handling. Update documentation for QQ and DingTalk chat integration in Japanese README.
