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

src/main.c

@@ -8,13 +8,13 @@
  * gcc -std=c17 -o gobang_console.exe *.c -lws2_32
    .\gobang_console.exe
  *
- * !图形化版本编译（需要SDL3）：
- * gcc -std=c17 -o gobang_gui.exe *.c -ID:\settings\SDL\SDL3-3.2.22\x86_64-w64-mingw32\include -LD:\settings\SDL\SDL3-3.2.22\x86_64-w64-mingw32\lib -lSDL3 -lws2_32
-   copy "D:\settings\SDL\SDL3-3.2.22\x86_64-w64-mingw32\bin\SDL3.dll" .
+ * !图形化版本编译（需要IUP库）：
+ * gcc -std=c17 -o gobang_gui.exe *.c -ID:\settings\settings\libs\iup-3.31_Win64_dllw6_lib\include -LD:\settings\settings\libs\iup-3.31_Win64_dllw6_lib -liup -lws2_32
+   copy "D:\settings\settings\libs\iup-3.31_Win64_dllw6_lib\iup.dll" .
    .\gobang_gui.exe
  *
  * @note gcc 为编译器，添加了-lws2_32链接Windows网络库
- * @note SDL3 的路径：D:\settings\SDL\SDL3-3.2.22\x86_64-w64-mingw32
+ * @note IUP 的路径：D:\settings\settings\libs\iup-3.31_Win64_dllw6_lib
  * @brief & "D:\Program Files (x86)\NSIS\makensis.exe" "installer\\installer.nsi"
  * @brief & "D:\Program Files (x86)\Inno Setup 6\iscc.exe" installer\\installer.iss
  */