Serves the RFC 9728 protected-resource metadata document MCP clients use to discover your authorization server:
# Phoenix router (path is fixed by RFC 9728)
forward "/.well-known/oauth-protected-resource",
Noizu.MCP.Auth.ProtectedResourceMetadataPlug,
resource: "https://api.example.com/mcp",
authorization_servers: ["https://auth.example.com"]Options: :resource (required), :authorization_servers (required),
:scopes_supported, :bearer_methods_supported, :extra (map merged in).