Support all CRUD operations for blogs and cascade deletion #15
Description
Currently, not all CRUD operations are supported for blogs. Please ensure that the backend API fully implements Create, Read, Update, and Delete functionality for blog entities. Additionally, deletion operations must be implemented with proper cascade behavior: when a blog is deleted, all related posts, comments, bookmarks, and other dependent records should be deleted automatically to maintain data integrity.
- Implement missing CRUD operations for blogs
- Ensure cascade deletion of all dependent records
- Add tests and documentation for these behaviors