Extend AuthService and LangflowMCPService to support updating MCP servers with multiple global variable headers (JWT, OWNER, OWNER_NAME, OWNER_EMAIL) during login. This enables passing user context to MCP servers via custom headers, improving downstream identification and authorization.
Added LangflowMCPService to update MCP servers with the user's JWT header after authentication. AuthService now triggers a background update to MCP servers on successful login, ensuring JWT propagation for downstream services.