chore(wails): scaffold v3 project boilerplate

Wails v3 replaces the NPM-only dev entry point. This adds the Go module,
Taskfile, build metadata, and a minimal window shell without touching
frontend logic.

Co-authored-by: Cursor <cursoragent@cursor.com>

build/linux/desktop

@@ -0,0 +1,13 @@
+[Desktop Entry]
+Version=1.0
+Name=My Product
+Comment=A sfxkeeb application
+# The Exec line includes %u to pass the URL to the application
+Exec=/usr/local/bin/sfxkeeb %u
+Terminal=false
+Type=Application
+Icon=sfxkeeb
+Categories=Utility;
+StartupWMClass=sfxkeeb
+
+