Give the host a cohesive vault-terminal look: header wordmark with a live
status pill that glows green while running, sectioned configuration card with
per-field labels, a terminal-style server log, richer player rows (id, name,
address, packet counts), and a bold Start/Stop control bar. All existing
bindings are unchanged.
Add publish-host.yml to build self-contained, single-file win-x64 and
linux-x64 binaries on the self-hosted runner and upload them as artifacts,
and document the untrimmed publish commands in the host README.
Delete the Qt host (src/, cmake/, CMakeLists.txt, find-qt.bat, check-setup.bat,
build.bat, deploy.bat) now that the Avalonia host in host/ covers it on the same
dotnet toolchain. Add a self-hosted host-build CI job and a host README, and
rewrite the top-level README for the C# server + Avalonia host layout.
