v6.1.2 / 20260228

• 🎨 vip：终身会员的激活时间显示为终身会员key生成时间，不考虑其他key的累加时间
• 📝 vip：vip设置添加答疑交流方法
• 🎨 订阅日历：完善设置，添加帮助文档
• 🐛 日历上传：使用思源S3设置，同时自定义bucket，没有使用自定义的bucket
• 🐛 日历上传：不开启定时同步无法显示S3设置
• 🐛 日历上传：手动上传 ICS 到云端，没有自动更新ICS 云端链接

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• 🎨 vip: The activation time for lifetime members is displayed as the generation time of the lifetime membership key, without considering the cumulative time of other keys.
• 📝 vip: Add Q&A communication methods in vip settings.
• 🎨 Subscription Calendar: Improve settings and add help documentation.
• 🐛 Calendar Upload: When using Siyuan S3 settings and customizing a bucket, the custom bucket is not utilized.
• 🐛 Calendar Upload: S3 settings cannot be displayed without enabling scheduled synchronization.
• 🐛 Calendar Upload: Manually uploading ICS to the cloud does not automatically update the ICS cloud link.