Avoid `eccrypto` and `elliptic` dependencies if possible

https://github.com/torusresearch/toprf-sdk/blob/f84134a38922278cef9a07acba0c5bd9a24588c3/packages/auth-network-utils/package.json#L71-L73

`eccrypto` and `elliptic` can be considered legacy packages and we should attempt to avoid them. Use `@noble/curves` instead?

Start with packages/auth-network-utils/package.json at the linked dependency lines and inspect where eccrypto and elliptic are used. Determine whether @noble/curves can cover those uses without changing behavior; the work is done when the legacy dependencies are no longer needed and the package remains functional.

Written by the indexing model from the issue text.