Add convenience helpers for common action responses

### Description

Actions frequently return similar types of responses (e.g. success, client error). Provide a simplified way to generate these responses to reduce repetition and improve readability.

### Acceptance Criteria

- Developers can easily return:
- Successful responses
- Client error responses (e.g. bad request)
- Helpers reduce the need for manual payload construction
- Helpers are intuitive and promote consistent usage

### Notes

- Avoid locking into specific method names
- Should remain flexible for future response types