- Convert RTorrentClient.test.js to use vi.mock() instead of jest.mock()
- Convert QBittorrentClient.test.js to use vi.mock() instead of jest.mock()
- Convert SABnzbdClient.test.js to use vi.mock() instead of jest.mock()
- Convert TransmissionClient.test.js to use vi.mock() instead of jest.mock()
- Convert downloadClients.test.js to use vi.mock() instead of jest.mock()
- Convert integration/downloadClients.test.js to use vi.mock() instead of jest.mock()
- Fix legacy qbittorrent.test.js to import QBittorrentClient from new location
- Add getRtorrentInstances mock to downloadClients.test.js
- Add RTORRENT_INSTANCES to integration test environment variables
- QBittorrentClient now uses the incremental Sync API instead of repeatedly
fetching the full torrent list via /api/v2/torrents/info.
- Per-client state: lastRid, torrentMap, fallbackThisCycle.
- Handles full_update, delta updates, and torrents_removed.
- Falls back to legacy torrents/info at most once per poll cycle.
- getAllTorrents() resets fallback flags before each cycle.
- Added 9 new unit tests covering: first sync, delta merge, full_update,
torrents_removed, fallback path, direct-legacy-after-fallback, 403 re-auth,
completed-field computation, and fallback reset.
