add test vectors

[lescuer97]

Adds test vectors for the deterministic test vector for the nut.

nut pr: cashubtc/nuts#331

replaces: #68

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Latest commit: 9a5d893

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve the legacy public-key ID for restored P2PK keys

publicKeyHex is the repository key that generateNewKeyPair() stores and that signProof()/getKeyPair() later look up by exact string. Changing it from the old '02' + schnorr.getPublicKey(secretKey) form to secp256k1.getPublicKey(secretKey, true) changes the identifier for every key whose secp256k1 point has odd Y (the new tests show several 03... cases). That means a wallet restored from seed on this release will re-derive and persist a different publicKeyHex than previous releases, so previously shared or minted P2PK proofs locked to the legacy value can no longer be matched after a DB wipe/restore, breaking recovery of existing funds unless there is a migration or backward-compatible aliasing layer.

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