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

entrypoint.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+cd "$HOME"/rustdesk || exit 1
+# shellcheck source=/dev/null
+. "$HOME"/.cargo/env
+
+argv=$*
+
+while test $# -gt 0; do
+  case "$1" in
+  --release)
+    mkdir -p target/release
+    test -f target/release/libsciter-gtk.so || cp "$HOME"/libsciter-gtk.so target/release/
+    release=1
+    shift
+    ;;
+  --target)
+    shift
+    if test $# -gt 0; then
+      rustup target add "$1"
+      shift
+    fi
+    ;;
+  *)
+    shift
+    ;;
+  esac
+done
+
+if [ -z $release ]; then
+  mkdir -p target/debug
+  test -f target/debug/libsciter-gtk.so || cp "$HOME"/libsciter-gtk.so target/debug/
+fi
+set -f
+#shellcheck disable=2086
+VCPKG_ROOT=/vcpkg cargo build --locked $argv