[Sugesstion] Use Standard Timestamp Format in Logs

[Ryananana]

The timestamp format currently used will cause timestamp errors when reading logs with lnav While this is not a problem, it can cause inconvenience in analyzing the logs. I recommend using a standard timestamp format like iso8601.

[Ryananana]

https://github.com/SagerNet/sing-box/blob/88fad9fdadb179511af440a8b8894a2df3e56216/log/log.go#L50C22-L50C47 change to "2006-01-02T15:04:05-0700" to satisfy ISO8601 Timestamp Format.

[github-actions[bot]]

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