version update check, fix Shortcut key

• 完善tips
• 完善检查更新机制
• 修复快捷键生效问题， 需要设置->隐私与安全->辅助功能 删除旧app 添加新app 生效
  这次固定了签名，下次就不用再重新添加辅助功能权限了... 😄期望如此.
• 修复 快捷键捕获 原理

What’s New

• Improved tips and user guidance.
• Improved the update checking process.
• Fixed an issue where shortcuts sometimes wouldn’t work until Accessibility permissions were re-added manually.
  • We’ve now switched to a stable app signature, so future updates should no longer require re-authorizing Accessibility permissions. 😄
• Improved the underlying shortcut detection mechanism for better reliability.