feat(desktop): add GitHub Actions workflow for cross-platform releases

- Add desktop-release.yml workflow for automated Windows/macOS builds
- Fix frontendDist path in tauri.conf.json for production builds
- Builds macOS (arm64 + x64) and Windows (MSI + NSIS) on native runners
- Creates GitHub Release with all artifacts on tag push or manual dispatch

To trigger a release:
  git tag desktop-v0.3.0 && git push origin desktop-v0.3.0
Or use workflow_dispatch from GitHub Actions UI

Co-Authored-By: claude-flow <ruv@ruv.net>

rust-port/wifi-densepose-rs/crates/wifi-densepose-desktop/tauri.conf.json

@@ -4,7 +4,7 @@
   "version": "0.3.0",
   "identifier": "net.ruv.ruview",
   "build": {
-    "frontendDist": "../ui/dist",
+    "frontendDist": "ui/dist",
     "devUrl": "http://localhost:5173",
     "beforeDevCommand": "cd ../ui && npm run dev",
     "beforeBuildCommand": "cd ../ui && npm run build"