Adds build-windows-release and deploy-windows-to-server Taskfile tasks,
a build-windows CI job (requires a windows-runner self-hosted runner),
and extends updateInfoProvider to also cover Platform.isWindows.
latest.json is now extended with a 'windows' key; both deploy tasks
preserve the other platform's URL when updating the file.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Build task embeds GIT_HASH via --dart-define; new deploy-linux-to-server task
packages a tar.gz and updates latest.json on the server. The account list screen
shows a MaterialBanner when a newer Linux build is available.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Thomas Güttler