Elin environment variables

The Anthropic API key must be set in the elin environment for the OpenClaw Gateway to authenticate API calls to Anthropic. The Anthropic API key was added to the elin environment and resulted in successful OpenClaw Gateway authentication and Claude response. The Anthropic API key must be set in the elin environment for the OpenClaw Gateway to authenticate API calls to Anthropic. The Anthropic API key was added to the elin environment and resulted in successful OpenClaw Gateway authentication and Claude response.