feat(add-base-path): 支持配置basePath以部署到子路径

[zhangxin-github]

• 在next.config.ts中添加basePath配置项，默认从环境变量NEXT_PUBLIC_BASE_PATH读取
• 更新docker-compose.yml，添加NEXT_PUBLIC_BASE_PATH环境变量配置
• 修改聊天面板、消息显示、示例面板等多个组件中的图片和API请求路径
• 统一引入nextConfig并应用到fetch请求和图片src属性中

[vercel]

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[DayuanJiang]

Thanks for the PR! There's an overlapping PR #311 addressing the same issue.

I noticed #311 has a cleaner utility abstraction and documentation, while yours covers the about pages. However, note that next/image automatically handles basePath, so the Image src changes may cause double-prefixing.

I'll proceed with #311 as the base and close this one as a duplicate. Feel free to review there or suggest any improvements.