Turn the package into a lib plus thin bin on Tauri v2 with a root-level
tauri.conf.json, capabilities, generated icons (keeping the hand-tuned
icon.ico) and a placeholder bubble page. The Win32 modules leave the
module tree until each one is ported; their sources stay on disk.
tauri-build now embeds the icon, a VERSIONINFO from the Cargo version and
a PerMonitorV2 manifest, replacing res/icon.rc and its stale 0.1.0.
