This pull request adds support for deriving the correct Langflow URL in IBM SaaS environments and updates the authentication and logout logic accordingly. The changes ensure that users in IBM auth mode are directed to the correct Langflow instance and that logout behavior is consistent with authentication modes.

IBM SaaS Langflow URL derivation:

• Added a new utility function deriveCloudLangflowUrl in url-utils.ts to generate the appropriate Langflow URL for IBM SaaS deployments by transforming the current OpenRAG URL.
• Updated settings/page.tsx to use deriveCloudLangflowUrl when in IBM auth mode, ensuring the correct Langflow URL is used in the UI. [1] [2]

Authentication logic updates:

• Extended the useAuth hook in settings/page.tsx to include isIbmAuthMode, enabling conditional logic based on IBM authentication.
• Modified the logout function in auth-context.tsx to allow logout only when not in no-auth mode, removing the IBM auth mode restriction for consistency.