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/ffmpeg/patch/0009-fix-nvenc-reconfigure-blur.patch

@@ -0,0 +1,28 @@
+From bec8d49e75b37806e1cff39c75027860fde0bfa2 Mon Sep 17 00:00:00 2001
+From: 21pages <sunboeasy@gmail.com>
+Date: Fri, 27 Dec 2024 08:43:12 +0800
+Subject: [PATCH] fix nvenc reconfigure blur
+
+Signed-off-by: 21pages <sunboeasy@gmail.com>
+---
+ libavcodec/nvenc.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
+index 2cce478be0..f4c559b7ce 100644
+--- a/libavcodec/nvenc.c
++++ b/libavcodec/nvenc.c
+@@ -2741,8 +2741,8 @@ static void reconfig_encoder(AVCodecContext *avctx, const AVFrame *frame)
+         }
+ 
+         if (reconfig_bitrate) {
+-            params.resetEncoder = 1;
+-            params.forceIDR = 1;
++            params.resetEncoder = 0;
++            params.forceIDR = 0;
+ 
+             needs_encode_config = 1;
+             needs_reconfig = 1;
+-- 
+2.43.0.windows.1
+