AstrBot Desktop v4.26.0-beta.1

Automated desktop package release.

• Source: https://github.com/AstrBotDevs/AstrBot.git
• Ref: v4.26.0-beta.1
• Mode: tag-poll
• Windows package formats: nsis installer and portable zip.
• Windows portable zip uses manual replacement updates and requires WebView2 to already exist on the host.

What's Changed

• fix: avoid taskkill during Windows shutdown by @zouyonghe in #137
• feat: add desktop startup tray settings by @zouyonghe in #138

Full Changelog: v4.25.5...v4.26.0-beta.1