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

flutter/run.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+cargo install flutter_rust_bridge_codegen --version 1.80.1 --features uuid --locked
+flutter pub get
+~/.cargo/bin/flutter_rust_bridge_codegen --rust-input ../src/flutter_ffi.rs --dart-output ./lib/generated_bridge.dart --c-output ./macos/Runner/bridge_generated.h
+# call `flutter clean` if cargo build fails
+# export LLVM_HOME=/Library/Developer/CommandLineTools/usr/
+cargo build --locked --features flutter
+flutter run $@