mcp-graylog 0.3.2

Fixes Graylog access token authentication.

• Sends access tokens as Basic Auth <token>:token, as required by Graylog.
• Keeps the X-Requested-By header fix released in v0.3.0.
• Retains native MCP 2.1 support instead of reverting to MCP 1.x.
• Updates the message search test fixture to match the current Graylog Search Scripting API response.

Thanks to @kostazol and @adacio for reporting, validating, and testing the authentication and CSRF failures in PRs #3 and #5.