feat: add optional pinned Cua Hyprland plugin package

Import the unchanged recipe from the cua-driver-rs-v0.24.0 build kit. Keep fast-ring automatic builds disabled pending native channel qualification and document explicit ABI updates and compositor restarts.

pkgbuilds/cua-hyprland-plugin/.omarchy/package.json

@@ -0,0 +1,5 @@
+{
+  "source": "local",
+  "release_ring": "fast",
+  "skip_build": true
+}