Add support for passing sourceHeaders when fetching NZB/torrent files: extend AddDownloadOptions and SABnzbd AddNZBOptions, forward headers in sabnzbd and nzbget clients, and populate sourceHeaders in download-torrent.processor (injecting Prowlarr API key as X-Api-Key for proxy URLs). Make OIDC request scope conditional: only include the 'groups' scope when group-based access control or admin-claim is enabled (update provider logic, add tests, and update setup UI text). Also remove explicit take:100 in Plex processors and add CLAUDE guidance about requesting approval before implementing code changes.
Adds file hash-based matching for Audiobookshelf library items to ensure 100% accurate ASIN assignment for RMAB-organized content. Removes fuzzy matching from library availability checks, making all matching ASIN-only to eliminate false positives and race conditions. Updates database schema, processors, and matcher utilities; adds new tests and documentation for the new matching strategy. Removes obsolete scripts, Dockerfile, and related tests; updates docker-compose for test environments.
Introduced a Vitest-based backend unit testing framework with supporting scripts, helpers, and GitHub Actions integration. Refactored the admin settings page to a modular architecture, splitting monolithic logic into feature-specific tabs and hooks for improved maintainability and testability. Updated documentation to reflect the new testing setup and settings architecture, and added new dependencies for testing utilities.