rename: IUP 库目录重命名为 libs/IUP

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

libs/IUP/include/iupdraw_cd.h

@@ -0,0 +1,21 @@
+/** \file
+ * \brief IupDraw CD driver
+ *
+ * See Copyright Notice in iup.h
+ */
+
+#ifndef __CD_IUPDRAW_H
+#define __CD_IUPDRAW_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+cdContext* cdContextIupDraw(void);
+#define CD_IUPDRAW cdContextIupDraw()
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef __CD_IUPDRAW_ */