feat(gui): 迁移图形界面库从SDL3到IUP

- 移除SDL3依赖，引入IUP图形界面库
- 更新Makefile以支持IUP编译配置
- 重构GUI模块，移除SDL相关代码
- 更新全局变量和类型定义，移除SDL依赖
- 添加IUP头文件到项目库目录
- 删除手动帧率控制(SDL_Delay)，依赖IUP事件循环
- 更新编译脚本和文档说明

libs/iup-3.31_Win64_dllw6_lib/include/iuplua.h

@@ -0,0 +1,54 @@
+/** \file
+ * \brief IUP Binding for Lua.
+ *
+ * See Copyright Notice in "iup.h"
+ */
+ 
+#ifndef __IUPLUA_H 
+#define __IUPLUA_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifndef DOXYGEN_SHOULD_IGNORE_THIS
+/** @cond DOXYGEN_SHOULD_IGNORE_THIS */
+#ifndef IUPLUA_API
+#ifdef IUPLUA_BUILD_LIBRARY
+  #ifdef __EMSCRIPTEN__
+    #include <emscripten.h>
+    #define IUPLUA_API EMSCRIPTEN_KEEPALIVE
+  #elif WIN32
+    #define IUPLUA_API __declspec(dllexport)
+  #elif defined(__GNUC__) && __GNUC__ >= 4
+    #define IUPLUA_API __attribute__ ((visibility("default")))
+  #else
+    #define IUPLUA_API
+  #endif
+#else
+  #define IUPLUA_API
+#endif /* IUPLUA_BUILD_LIBRARY */
+#endif /* IUPLUA_API */
+/** @endcond DOXYGEN_SHOULD_IGNORE_THIS */
+#endif /* DOXYGEN_SHOULD_IGNORE_THIS */
+
+
+IUPLUA_API int iuplua_open(lua_State *L);
+IUPLUA_API int iupkey_open(lua_State *L);  /* does nothing, kept for backward compatibility */
+IUPLUA_API int iuplua_close(lua_State * L);
+
+/* utilities */
+IUPLUA_API int iuplua_isihandle(lua_State *L, int pos);
+IUPLUA_API Ihandle* iuplua_checkihandle(lua_State *L, int pos);
+IUPLUA_API void iuplua_pushihandle(lua_State *L, Ihandle *n);
+IUPLUA_API int iuplua_dofile(lua_State *L, const char *filename);
+IUPLUA_API int iuplua_dostring(lua_State *L, const char *string, const char *chunk_name);
+IUPLUA_API int iuplua_dobuffer(lua_State *L, const char *buffer, int len, const char *chunk_name);
+IUPLUA_API void iuplua_show_error_message(const char *pname, const char* msg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif