Fixed issues preventing successful authentication:
- Corrected Argon2 memory limit handling (API sends bytes, not KB)
- Replaced Blake2b with crypto_kdf_derive_from_key for login subkey derivation
- Fixed serde field names to match API expectations (srpUserID, sessionID)
- Added non-interactive mode for CLI testing
- Added support for ENTE_ENDPOINT environment variable
The implementation now matches the web client's key derivation exactly,
enabling successful authentication with both local and production servers.
Co-Authored-By: Claude <noreply@anthropic.com>
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