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/linux/wayland_shortcuts_inhibit.h

@@ -0,0 +1,22 @@
+// Wayland keyboard shortcuts inhibit support
+// This module provides functionality to inhibit system keyboard shortcuts
+// on Wayland compositors, allowing remote desktop windows to capture all
+// key events including Super, Alt+Tab, etc.
+
+#ifndef WAYLAND_SHORTCUTS_INHIBIT_H_
+#define WAYLAND_SHORTCUTS_INHIBIT_H_
+
+#include <gtk/gtk.h>
+
+#if defined(GDK_WINDOWING_WAYLAND) && defined(HAS_KEYBOARD_SHORTCUTS_INHIBIT)
+
+// Initialize shortcuts inhibit for a sub-window created by desktop_multi_window plugin.
+// This sets up focus-based inhibitor management: inhibitor is created when
+// the window gains focus and destroyed when it loses focus.
+//
+// @param view The FlView of the sub-window
+void wayland_shortcuts_inhibit_init_for_subwindow(void* view);
+
+#endif  // defined(GDK_WINDOWING_WAYLAND) && defined(HAS_KEYBOARD_SHORTCUTS_INHIBIT)
+
+#endif  // WAYLAND_SHORTCUTS_INHIBIT_H_