docs: 更新文档首页标题和免责声明

- 将标题从 "Introduction/简介" 改为 "libvips_ffi"
- 简化首段描述文本
- 添加第三方绑定免责声明，明确非官方项目
- 说明由 FlutterCandies 独立维护
- 引导用户通过 GitHub Issues 反馈问题
- 中英文文档同步更新

Signed-off-by: Caijinglong <[email protected]>

Author: CaiJingLong

docs/website/docs/intro.md

@@ -3,9 +3,15 @@ sidebar_position: 1
 slug: /
 ---
 
-# Introduction
+# libvips_ffi
 
-**libvips_ffi** is a high-performance image processing library for Flutter and Dart, powered by [libvips](https://www.libvips.org/).
+High-performance image processing for Flutter and Dart.
+
+:::warning Disclaimer
+This is a **third-party** language binding for libvips, **not an official libvips project**. It is maintained independently by [FlutterCandies](https://github.com/fluttercandies). The libvips team does not provide support for this package. For issues and questions, please use [GitHub Issues](https://github.com/fluttercandies/libvips_ffi/issues).
+:::
+
+Powered by [libvips](https://www.libvips.org/).
 
 ## Why libvips_ffi?
 

docs/website/i18n/zh-Hans/docusaurus-plugin-content-docs/current/intro.md

@@ -3,9 +3,15 @@ sidebar_position: 1
 slug: /
 ---
 
-# 简介
+# libvips_ffi
 
-**libvips_ffi** 是一个高性能的 Flutter 和 Dart 图像处理库，基于 [libvips](https://www.libvips.org/) 构建。
+Flutter 和 Dart 高性能图像处理库。
+
+:::warning 声明
+这是 libvips 的**第三方**语言绑定，**非 libvips 官方项目**。由 [FlutterCandies](https://github.com/fluttercandies) 独立维护。libvips 官方团队不为本包提供支持。如有问题，请使用 [GitHub Issues](https://github.com/fluttercandies/libvips_ffi/issues)。
+:::
+
+基于 [libvips](https://www.libvips.org/) 构建。
 
 ## 为什么选择 libvips_ffi？