chore: bump version to 4.26.0-beta.8

changelogs/v4.26.0-beta.8.md

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+- [更新日志(简体中文)](#chinese)
+- [Changelog(English)](#english)
+
+<a id="chinese"></a>
+
+## What's Changed
+
+### 重点更新
+
+- 优化 WebUI 升级流程：Core 更新改为后台任务，并在检测到 WebUI 与 Core 版本错配时提供自动恢复重启引导，避免刷新页面后卡在 `Missing API key`。([#8846](https://github.com/AstrBotDevs/AstrBot/pull/8846))
+- 增强 QQ 官方机器人群聊能力，支持群消息创建类型，并允许 Webhook 适配器在无缓存 `msg_id` 时主动发送群消息。([#8838](https://github.com/AstrBotDevs/AstrBot/pull/8838), [#8841](https://github.com/AstrBotDevs/AstrBot/pull/8841))
+
+### 修复
+
+- 修复人格编辑时重名校验不准确的问题。([#8843](https://github.com/AstrBotDevs/AstrBot/pull/8843))
+- 加固沙箱文件传输与 CUA 健康检查流程，降低异常环境下的文件操作风险。([#8840](https://github.com/AstrBotDevs/AstrBot/pull/8840))
+
+### 其他
+
+- 将 `faiss-cpu` 版本基线从 `1.12.0` 调整为 `1.14.3`。([#8837](https://github.com/AstrBotDevs/AstrBot/pull/8837))
+
+<a id="english"></a>
+
+## What's Changed (EN)
+
+### Highlights
+
+- Improved the WebUI upgrade flow by running Core updates as background tasks and adding guided recovery when WebUI/Core version mismatches are detected, preventing refreshes from leaving users stuck at `Missing API key`. ([#8846](https://github.com/AstrBotDevs/AstrBot/pull/8846))
+- Enhanced QQ Official Bot group chat support with group message create events and proactive Webhook group sends without requiring a cached `msg_id`. ([#8838](https://github.com/AstrBotDevs/AstrBot/pull/8838), [#8841](https://github.com/AstrBotDevs/AstrBot/pull/8841))
+
+### Bug Fixes
+
+- Fixed duplicate-name validation when editing personas. ([#8843](https://github.com/AstrBotDevs/AstrBot/pull/8843))
+- Hardened sandbox file transfers and CUA health checks to reduce file-operation risk in abnormal environments. ([#8840](https://github.com/AstrBotDevs/AstrBot/pull/8840))
+
+### Other
+
+- Changed the `faiss-cpu` version baseline from `1.12.0` to `1.14.3`. ([#8837](https://github.com/AstrBotDevs/AstrBot/pull/8837))