[feat] add Windows screen capture method setting

apps/desktop/src/screen_capturer/screen_capture_method.h

@@ -0,0 +1,22 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-09-11
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _SCREEN_CAPTURE_METHOD_H_
+#define _SCREEN_CAPTURE_METHOD_H_
+
+namespace crossdesk {
+
+// Persisted values; keep these in the same order as the settings choices.
+enum class ScreenCaptureMethod { Auto = 0, Dxgi = 1, Wgc = 2, Gdi = 3 };
+
+inline bool IsValidScreenCaptureMethod(long value) {
+  return value >= static_cast<long>(ScreenCaptureMethod::Auto) &&
+         value <= static_cast<long>(ScreenCaptureMethod::Gdi);
+}
+
+}  // namespace crossdesk
+
+#endif