support for MCP server in combination with authentication/protected pages

[svanhoof]

Virtually all our documentation pages are only accessible by users belonging to a group. That works well.

Now the MCP server is also a feature we like to use. However today it works only on public pages. Ideally we could generate keys per group and pass that key when contacting the MCP server. That would allow users who have that key to leverage the MCP server fully.

The full MCP server oAuth flow would be even better.