Initial commit: RustDesk 1.4.7 macOS desktop port

- Filled empty libs/hbb_common/ submodule (cloned from rustdesk/hbb_common)
- Patched Flutter 3.44 / Dart 3.12 compatibility:
  * flutter/lib/generated_bridge.dart: asTypedList with cast<>, DartPort=Int64
  * flutter/lib/common.dart: DialogTheme->DialogThemeData, TabBarTheme->TabBarThemeData
  * flutter/pubspec.yaml: extended_text 14.0.0->15.0.2, google_fonts override 5.0.0
  * flutter/macos/Runner/Configs/Release.xcconfig: EXCLUDED_ARCHS=x86_64
- Build verified: cargo check + cargo build --features flutter + cargo build --release --features flutter
- Verified flutter build macos --debug and --release both produce working .app
- Verified .dmg installer (27MB arm64) created via hdiutil
- Build deps: Xcode 26.5, CocoaPods 1.16.2, Flutter 3.44, VCPKG arm64-osx

res/PKGBUILD

@@ -0,0 +1,35 @@
+pkgname=rustdesk
+pkgver=1.4.7
+pkgrel=0
+epoch=
+pkgdesc=""
+arch=('x86_64')
+url=""
+license=('AGPL-3.0')
+groups=()
+depends=('gtk3' 'xdotool' 'libxcb' 'libxfixes' 'alsa-lib' 'libva' 'libappindicator-gtk3' 'pam' 'gst-plugins-base' 'gst-plugin-pipewire')
+makedepends=()
+checkdepends=()
+optdepends=()
+provides=()
+conflicts=()
+replaces=()
+backup=()
+options=()
+install=pacman_install
+changelog=
+noextract=()
+md5sums=() #generate with 'makepkg -g'
+
+package() {
+  if [[ ${FLUTTER} ]]; then
+	  mkdir -p "${pkgdir}/usr/share/rustdesk" && cp -r ${HBB}/flutter/build/linux/x64/release/bundle/* -t "${pkgdir}/usr/share/rustdesk"
+  fi
+  mkdir -p "${pkgdir}/usr/bin"
+  pushd ${pkgdir} && ln -s /usr/share/rustdesk/rustdesk usr/bin/rustdesk && popd
+  install -Dm 644 $HBB/res/rustdesk.service -t "${pkgdir}/usr/share/rustdesk/files"
+  install -Dm 644 $HBB/res/rustdesk.desktop -t "${pkgdir}/usr/share/rustdesk/files"
+  install -Dm 644 $HBB/res/rustdesk-link.desktop -t "${pkgdir}/usr/share/rustdesk/files"
+  install -Dm 644 $HBB/res/128x128@2x.png "${pkgdir}/usr/share/icons/hicolor/256x256/apps/rustdesk.png"
+  install -Dm 644 $HBB/res/scalable.svg "${pkgdir}/usr/share/icons/hicolor/scalable/apps/rustdesk.svg"
+}