Add Rust port of btcrecover for Bitcoin and Ethereum functionality

[Copilot]

Rust implementation of btcrecover's core Bitcoin and Ethereum wallet recovery functionality in btcrecover-rs/. Self-contained project, no changes to existing Python code.

Modules

• bip39/ — Mnemonic validation, checksum verification, PBKDF2-HMAC-SHA512 seed derivation, embedded English wordlist
• bip32/ — HD key derivation via HMAC-SHA512 chain, hardened/normal child keys, secp256k1 public key generation
• bitcoin/ — P2PKH, P2SH-P2WPKH, P2WPKH (Bech32) address generation; Bitcoin Core wallet.dat password verification (SHA512 + AES-256-CBC)
• ethereum/ — Keccak-256 address derivation, EIP-55 checksums; MetaMask vault recovery (Desktop: PBKDF2-SHA256 + AES-256-GCM, Mobile: PBKDF2-SHA512 + AES-256-CBC); Ethereum Keystore V3 MAC verification
• recovery/ — Parallel seed recovery (single-word replacement across all positions) and password recovery engines using Rayon
• CLI — address, validate, seed-recover, password-recover subcommands via clap

Usage

cd btcrecover-rs && cargo build --release

# Generate addresses
btcrecover-rs address -m "abandon abandon ... about" -b ethereum
btcrecover-rs address -m "abandon abandon ... about" -b bitcoin --address-type p2wpkh

# Recover seed with one wrong word
btcrecover-rs seed-recover \
  -m "abandon abandon ... wrong" \
  -a "0x9858EfFD232B4033E47d90003D41EC34EcaEda94" \
  -b ethereum

Testing

51 tests (49 unit + 2 doc-tests) verified against official BIP39/BIP32 test vectors. Existing Python test suite (670 tests) unaffected.

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