YouYong · Placeholder

网站准备中 Site coming soon

这是 YouYong 的静态占位页。内容正在准备中，页面保持简洁、响应式，并且不依赖任何外部资源。

This is the static placeholder for YouYong. It stays minimal, responsive, and free of external dependencies.

• Production: youyong.app · www.youyong.app
• Staging: yyapp-staging on workers.dev
• Security headers and cache controls are preconfigured