refactor: make the 'endpoints' path optional in the librechat.yaml file

[badcom]

Pull Request Template

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Summary

Make the endpoints path of the librechat.yaml file optional (we discussing this on discord)

Change Type

Please delete any irrelevant options.

• [x] Bug fix (non-breaking change which fixes an issue)

Testing

Add a librechat.yaml file to your project without the endpoints: path. The file must have at least the "version" and "cache" paths.

Test Configuration:

See above

Checklist

• [x] My code adheres to this project's style guidelines
• [x] I have performed a self-review of my own code
• [x] I have commented in any complex areas of my code
• [] I have made pertinent documentation changes
• [x] My changes do not introduce new warnings
• [ ] I have written tests demonstrating that my changes are effective or that my feature works
• [x] Local unit tests pass with my changes
• [x] Any changes dependent on mine have been merged and published in downstream modules.