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/msi/CustomActions/Common.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <Windows.h>
+#include <string>
+
+bool AddFirewallRule(bool add, LPWSTR exeName, LPWSTR exeFile);
+
+bool QueryServiceStatusExW(LPCWSTR serviceName, SERVICE_STATUS_PROCESS* status);
+bool IsServiceRunningW(LPCWSTR serviceName);
+bool MyCreateServiceW(LPCWSTR serviceName, LPCWSTR displayName, LPCWSTR binaryPath);
+bool MyDeleteServiceW(LPCWSTR serviceName);
+bool MyStartServiceW(LPCWSTR serviceName);
+bool MyStopServiceW(LPCWSTR serviceName);
+
+std::wstring ReadConfig(const std::wstring& filename, const std::wstring& key);
+
+void UninstallDriver(LPCWSTR hardwareId, BOOL &rebootRequired);
+
+namespace RemotePrinter
+{
+    VOID installUpdatePrinter(const std::wstring& installFolder);
+    VOID uninstallPrinter();
+}