Function deriveH160

Derive the H160 EVM address from a 32-byte Substrate public key.

Asset Hub pallet-revive uses these derivation rules:

• If the account was originally EVM-derived (last 12 bytes are all 0xEE): strip the padding to recover the original H160 address.
• If native Substrate account (sr25519/ed25519): keccak256(publicKey), take last 20 bytes. One-way mapping.