feat(client-encrypt): create @bytelyst/client-encrypt — Web Crypto API encryption
- AES-256-GCM via SubtleCrypto (browsers + React Native with polyfill)
- Wire-compatible EncryptedField with @bytelyst/field-encrypt (server) and
BLFieldEncrypt (Swift/Kotlin native SDKs)
- encryptField, decryptField, generateKey, keyFromHex, keyToHex
- PBKDF2 key derivation (600k iterations per OWASP 2023)
- isEncryptedField type guard, toHex/fromHex helpers
- 22 Vitest tests, all passing
- Add Web Crypto globals to root ESLint config
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