Add max secret length #234
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This was referenced Mar 6, 2025
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This is in order to prevent a DOS attack using long secrets, currently enforced in nutshell but not specified https://github.com/cashubtc/nutshell/blob/72ac35405c94084164c697f54e990c547393722d/cashu/mint/verification.py#L162-L170. Default of 512 https://github.com/cashubtc/nutshell/blob/72ac35405c94084164c697f54e990c547393722d/cashu/core/settings.py#L62