feat(sdk): Add Crypto SDK for all 12 languages
Implements quantum-resistant cryptographic primitives across all SDK languages:
- Hybrid Ed25519 + Dilithium3 signatures (classical + post-quantum)
- BIP-39 mnemonic support (12, 15, 18, 21, 24 words)
- BIP-44 hierarchical key derivation (coin type 0x5359)
- Post-quantum algorithms: Falcon (FIPS 206), SPHINCS+ (FIPS 205)
- Key derivation: HKDF-SHA3-256, PBKDF2
- Hash functions: SHA3-256, BLAKE3, Keccak-256
Languages: JavaScript/TypeScript, Python, Go, Rust, Flutter/Dart, Java,
Kotlin, Swift, C, C++, C#/.NET, Ruby
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