fix:修复并发条件下，token失效时间太短

[JavaPythonAIForBAT]

原token在redis中存储5秒中就会失效，这时5秒内还可以用旧的token，一旦超过5秒就不能用旧的token必须得用新的，但是在并发条件下，请求响应太慢时，是不合理的，用旧的token会报失效。

[gemini-code-assist]

Summary of Changes

Hello @JavaPythonAIForBAT, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在解决在并发请求场景下，由于 Token 默认失效时间过短（5秒）导致 Token 频繁失效的问题。通过将 Token 的默认过期时间延长至 60 秒，确保在网络延迟或系统负载较高时，客户端仍能有效使用其 Token，从而提升系统的稳定性和用户体验。

Highlights

• 修复Token失效时间: 将 signing/infrastructure/accesstokenimpl/config.go 文件中 Config 结构体的默认 Expire 时间从 5 秒增加到 60 秒，以解决并发条件下 Token 过早失效的问题。

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[gemini-code-assist]

Code Review

你好，感谢你的贡献。这次变更将旧 token 的默认宽限期从 5 秒延长到 60 秒，以解决并发条件下因响应慢而导致 token 失效的问题。这是一个合理的改动，能有效提高系统的鲁棒性。我有一个关于代码可读性的建议，即使用命名常量来代替硬编码的数字，具体请看我的评论。

[gemini-code-assist]

为了提高代码的可读性和可维护性，建议将 60 这个魔术数字提取为一个具名常量。例如，可以在文件顶部定义 const defaultTokenGracePeriodInSeconds = 60，然后在此处使用该常量。这能更清晰地表达这个值的含义（token 的宽限期），并且方便未来统一修改。