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/0008-remove-amf-loop-query.patch

@@ -0,0 +1,26 @@
+From 1440f556234d135ce58a2ef38916c6a63b05870e Mon Sep 17 00:00:00 2001
+From: 21pages <sunboeasy@gmail.com>
+Date: Sat, 14 Dec 2024 21:39:44 +0800
+Subject: [PATCH] remove amf loop query
+
+Signed-off-by: 21pages <sunboeasy@gmail.com>
+---
+ libavcodec/amfenc.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libavcodec/amfenc.c b/libavcodec/amfenc.c
+index f70f0109f6..a53a05b16b 100644
+--- a/libavcodec/amfenc.c
++++ b/libavcodec/amfenc.c
+@@ -886,7 +886,7 @@ int ff_amf_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
+                 av_usleep(1000);
+             }
+         }
+-    } while (block_and_wait);
++    } while (false); // already set query timeout
+ 
+     if (res_query == AMF_EOF) {
+         ret = AVERROR_EOF;
+-- 
+2.43.0.windows.1
+