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/vcpkg/libvpx/unofficial-libvpx-config.cmake.in

@@ -0,0 +1,49 @@
+if(NOT TARGET unofficial::libvpx::libvpx)
+  # Compute the installation prefix relative to this file.
+  get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
+  get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+  get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+
+  # Add library target (note: vpx always has a static build in vcpkg).
+  add_library(unofficial::libvpx::libvpx STATIC IMPORTED)
+
+  # Add interface include directories and link interface languages (applies to all configurations).
+  set_target_properties(unofficial::libvpx::libvpx PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include"
+    IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+  )
+  list(APPEND _IMPORT_CHECK_FILES "${_IMPORT_PREFIX}/include/vpx/vpx_codec.h")
+
+  # Add release configuration properties.
+  find_library(_LIBFILE_RELEASE NAMES vpx PATHS "${_IMPORT_PREFIX}/lib/" NO_DEFAULT_PATH)
+  set_property(TARGET unofficial::libvpx::libvpx
+    APPEND PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
+  set_target_properties(unofficial::libvpx::libvpx PROPERTIES
+    IMPORTED_LOCATION_RELEASE ${_LIBFILE_RELEASE})
+  list(APPEND _IMPORT_CHECK_FILES ${_LIBFILE_RELEASE})
+  unset(_LIBFILE_RELEASE CACHE)
+
+  # Add debug configuration properties.
+  if(@LIBVPX_CONFIG_DEBUG@)
+    find_library(_LIBFILE_DEBUG NAMES vpx PATHS "${_IMPORT_PREFIX}/debug/lib/" NO_DEFAULT_PATH)
+    set_property(TARGET unofficial::libvpx::libvpx
+      APPEND PROPERTY IMPORTED_CONFIGURATIONS DEBUG)
+    set_target_properties(unofficial::libvpx::libvpx PROPERTIES
+      IMPORTED_LOCATION_DEBUG ${_LIBFILE_DEBUG})
+    list(APPEND _IMPORT_CHECK_FILES ${_LIBFILE_DEBUG})
+    unset(_LIBFILE_DEBUG CACHE)
+  endif()
+
+  # Check header and library files are present.
+  foreach(file ${_IMPORT_CHECK_FILES} )
+    if(NOT EXISTS "${file}" )
+      message(FATAL_ERROR "unofficial::libvpx::libvpx references the file
+   \"${file}\"
+but this file does not exist.  Possible reasons include:
+* The file was deleted, renamed, or moved to another location.
+* An install or uninstall procedure did not complete successfully.
+")
+    endif()
+  endforeach()
+  unset(_IMPORT_CHECK_FILES)
+endif()