Add Examples for CLEANDB API to SwaggerUI Page

As a user, I would like to have some examples and documentation for the CLEANDB API to the SwaggerUI Page, similar to what is present for the OpenEnzyme Database Page.

<img width="2030" height="1459" alt="Image" src="https://github.com/user-attachments/assets/d21eb2b3-d503-4af2-99cb-a2e0effa2fdb" />

In this issue: https://github.com/moleculemaker/oed-api/pull/1