本地优先，而不是假装零网络。 Local-first, not faux-offline.
Youhu 采用本地优先、最小留痕、按功能联网的设计。这里讲清楚哪些内容保留在设备上，哪些能力会在你主动触发时联网。
Youhu is built around a local-first, minimal-retention, network-only-when-needed approach. This page explains what stays on your device and what only goes online when you explicitly trigger it.
1. 本地优先存储 1. Local-first storage
你的记录、星图、时光琥珀与暗房内容默认保存在当前设备。Youhu 支持密码保护的备份导出，但不会把这些内容当作长期可回看的云端聊天记录挂在服务器上。
Your records, star map, amber archive, and darkroom content stay on your device by default. Youhu supports password-protected exports, but this content is not kept on the server as a replayable long-term cloud chat log.
2. 匿名准入与权益 2. Anonymous access and entitlements
Youhu 会保存最小化的匿名准入状态、安装标识与订阅权益，用于判断创世身份、邀请关系与 Premium 权限。这些数据不要求真实姓名、手机号或邮箱。
Youhu stores the minimum anonymous access state, install identifier, and subscription entitlements needed to determine founder status, invite relationships, and Premium access. No real name, phone number, or email is required.
3. AI 回信与即时处理 3. AI replies and immediate processing
当你主动请求 AI 回信、宇宙来信或分析能力时，相关文本会通过加密链路发送到服务器与模型提供方做即时处理。它不会被保留为长期可回看的云端聊天历史。
When you actively request an AI reply, a cosmos letter, or analysis features, relevant text is sent over an encrypted connection for immediate processing by the server and model providers. It is not retained as a replayable long-term cloud chat history.
4. 设备控制权 4. Device control stays with you
你可以在应用内清空记录、导出加密备份、恢复备份，或切换语言与回信语言。Youhu 试图把实际控制权尽量留在你的设备和你的手里。
Inside the app you can clear records, export encrypted backups, restore backups, and switch both interface language and reply language. Youhu tries to keep practical control on your device and in your hands.