Implement issue title refining API in the backend

[thejhh]

Description

Implement an API in the backend to support the refining of issue titles. This enhancement should extend the current API capabilities, which only support body refining, to include title refining.

Acceptance Criteria

• The backend API is updated to include functionality for refining issue titles.
• The API accepts input for issue titles and returns refined titles based on predefined clarity and consistency standards.
• The API is tested to ensure it correctly refines titles and integrates seamlessly with existing systems.