feat: batch support for 70+ new coin types and ETH-BASE/ETH-ZKSYNC2 mappings
- Add 70+ EVM, Ed25519, Substrate, UTXO, ECDSA coin type mappings
- Support Substrate/Polkadot SS58 multi-byte network prefix encoding
- Support 0x hex signature format (EVM-style R|S|V) for UTXO coins
- Add ETH-BASE and ETH-ZKSYNC2 coin mappings