LF2 Port v0.1.5

Manual release build; no GitHub Actions or generated source is used.

• Adds AppImage and Android GitHub Release update paths.
• Keeps Android in both landscape orientations at SDL window creation.
• Routes unclaimed touch contacts through the same pointer path as mouse across all menus.
• Adds a mouse-only difficulty route that proves state changes 0 -> 2 -> 1.

The release remains a draft until the long-lived signed ARM64 release APK passes the package and device gates.