Fix C# single-file manifest packaging

[enaboapps]

Summary

The signed 0.2.0 installer creates a Program Files executable that crashes at startup with .NET Runtime reporting Failure processing application bundle. The package script embeds the uiAccess manifest into the published single-file .NET executable with mt.exe, which corrupts the bundle.

Scope

• Embed the uiAccess manifest through the C# app project build.
• Stop modifying the published single-file executable with mt.exe after publish.
• Keep Authenticode signing after publish.
• Rebuild the signed installer locally and verify the installed app launches.

Acceptance criteria

• Published Switchify PC.exe starts after signing and install.
• Installer remains signed.
• Installed app executable remains signed.
• uiAccess manifest remains included.