feat(host/windows): "Punktfunk Host" identity in Task Manager (icon + version info)

punktfunk-host.exe embedded no icon or version resources, so Task Manager and
Explorer showed a bare lowercase exe name with a generic icon. build.rs now
embeds the branded .ico + FileDescription "Punktfunk Host" / ProductName
"Punktfunk" via winresource (same pattern as the Windows client and the tray;
Linux packaging builds skip the block). The tray gets a matching "Punktfunk
Tray" description, and the SCM display name moves off lowercase
"punktfunk streaming host" to "Punktfunk Host" (applied idempotently by
`service install` on upgrade).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packaging/windows/punktfunk-host.iss

@@ -112,7 +112,9 @@ SetupIconFile={#BrandingDir}\punktfunk.ico
 WizardImageFile={#BrandingDir}\wizard-image-*.bmp
 WizardSmallImageFile={#BrandingDir}\wizard-small-*.bmp
 UninstallDisplayName=punktfunk host {#MyAppVersion}
-; The branded multi-size .ico (installed below) - the host exe embeds no icon resource.
+; The branded multi-size .ico (installed below). The host exe now embeds the same icon + a
+; "Punktfunk Host" FileDescription (build.rs winresource) for Task Manager/Explorer; the file
+; copy stays as the uninstall-entry icon.
 UninstallDisplayIcon={app}\punktfunk.ico
 
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