Major changes:
- Rename testEbooks() function to testMediaItems()
- Remove all old ebook test cases
- Update all /api/ebooks paths to /api/media-items
- Update TestContext: remove EbookID, add MediaItemID field
- Add admin media-items tests (Create, Update, Delete)
- Fix compilation errors and missing imports
Tests updated to use new API structure while maintaining test coverage.
Breaking change: /api/ebooks endpoints removed (use /api/media-items instead)
john-okeefe
758c5874eb