- Add BrowseDirectories() to library service with path traversal protection
- Add BrowseDirectories handler with proper error handling
- Register GET /api/libraries/browse endpoint (admin-only)
- Returns current path, parent path, and list of subdirectories
- Security: blocks "..", validates path exists, checks is directory
Fixes: Issue 2 (backend)
- Add HasFolders() method to LibraryService
- Validates library has at least one folder before operations
- Returns clear boolean result
- Follows service layer architecture pattern
Related: TestCollectionsBulkOperations fix
- Add library_types table with ebooks, comics, manga types
- Add libraries table for multiple library support
- Add library_folders table for multi-folder libraries
- Add library_visibility table for user access control
- Add media_items table replacing ebooks for broader media support
- Create backward compatibility views for existing API
- Implement library service with type validation and file extension handling
- Support modular extension for future media types
Manga type includes cbz/cbr archives as requested