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/mfx-dispatch/portfile.cmake

@@ -0,0 +1,40 @@
+vcpkg_download_distfile(
+    MISSING_CSTDINT_IMPORT_PATCH
+    URLS https://github.com/lu-zero/mfx_dispatch/commit/d6241243f85a0d947bdfe813006686a930edef24.patch?full_index=1
+    FILENAME fix-missing-cstdint-import-d6241243f85a0d947bdfe813006686a930edef24.patch
+    SHA512 5d2ffc4ec2ba0e5859d01d2e072f75436ebc3e62e0f6580b5bb8b9f82fe588e7558a46a1fdfa0297a782c0eeb8f50322258d0dd9e41d927cc9be496727b61e44
+)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO lu-zero/mfx_dispatch
+    REF "${VERSION}"
+    SHA512 12517338342d3e653043a57e290eb9cffd190aede0c3a3948956f1c7f12f0ea859361cf3e534ab066b96b1c211f68409c67ef21fd6d76b68cc31daef541941b0
+    HEAD_REF master
+    PATCHES
+        fix-unresolved-symbol.patch
+        fix-pkgconf.patch
+        0003-upgrade-cmake-3.14.patch
+        ${MISSING_CSTDINT_IMPORT_PATCH}
+)
+
+if(VCPKG_TARGET_IS_WINDOWS AND NOT VCPKG_TARGET_IS_MINGW)
+    vcpkg_cmake_configure(
+        SOURCE_PATH "${SOURCE_PATH}" 
+    )
+    vcpkg_cmake_install()
+    vcpkg_copy_pdbs()
+else()
+    if(VCPKG_TARGET_IS_MINGW)
+        vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
+    endif()
+    vcpkg_configure_make(
+        SOURCE_PATH "${SOURCE_PATH}"
+        AUTOCONFIG
+    )
+    vcpkg_install_make()
+endif()
+vcpkg_fixup_pkgconfig()
+  
+file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/include")
+vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/LICENSE")