Feature: Support OAuth2 (Keycloak) Authentication for Generated MCP Servers

[flefevre]

Description:
Currently, Langflow allows generating MCP (Model Context Protocol) servers from individual flows, which is a powerful feature for model deployment and contextual interaction.

This feature request proposes adding support for OAuth2 authentication — specifically using Keycloak — to the generated MCP servers, in line with the official MCP authorization specification.

Why this is useful:

• Ensures that access to generated MCP endpoints is secure and compliant with modern authentication practices.
• Makes it easier to integrate with enterprise identity providers (via Keycloak).
• Aligns Langflow-generated MCP servers with the recommended standards for authentication as defined in the MCP specification.

Proposed approach:

• Reuse or generalize the OAuth2/Keycloak authentication mechanism introduced in feat: sso with keycloak as well as serveral bug fixes #7346.
• Automatically inject the necessary auth configuration into generated MCP server code.
• Provide options in the UI to enable or disable authentication when exporting/generating a server.

Related resources:

MCP Authorization Spec: Related PR: #7346 (OAuth2/Keycloak support for Langflow)

Additional context:
This could open the door for broader adoption of Langflow-generated MCP servers in production environments with stricter authentication requirements.