Security issue: replace bad cryptography

https://github.com/tkey/tkey/blob/8512f3493e1eb00bdf752bdc706e765f12a81c68/packages/core/package.json#L42

The library has long been unmaintained: it is advised to replace it with audited `@noble/curves`

Start with packages/core/package.json at line 42 to identify the unmaintained cryptography dependency, then inspect the repository for its consumers and compare the required APIs with audited @noble/curves. Done means the old library is replaced without breaking the existing TypeScript package behavior and the project's validation passes.

Written by the indexing model from the issue text.