otalandim/dscatalog — reverse-engineered prompt

Build me a Java backend for a simple app called DS Catalog. It should work like a basic catalog service where someone can create, view, update, delete, and search catalog items, with clean data validation and friendly error messages.

Please set it up as a real backend project, not just sample code. Include a database setup for local development, clear API endpoints, tests for the main behavior, and a simple way to run everything locally. I also want the project to be organized so it’s easy to keep adding features later.

There’s already a GitHub Actions CI badge in the repo, so please make sure the build and tests can run in CI too. If you need current Java backend docs or conventions, look them up online and use the normal modern approach.