feat: Windows增加分辨率适应，切换分辨率按钮修改

webrtc_controller_flutter/windows/runner/main.cpp

@@ -26,7 +26,8 @@ int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
 
   FlutterWindow window(project);
   Win32Window::Point origin(10, 10);
-  Win32Window::Size size(1280, 720);
+  // 竖屏 16:9 窗口（宽:高 = 9:16），适配控制端竖屏画面。
+  Win32Window::Size size(450, 800);
   if (!window.Create(L"webrtc_controller_flutter", origin, size)) {
     return EXIT_FAILURE;
   }