docs: fact-check sweep, Jellyfin, *arr stack, and ROM scraping guides

Fact-check results:
- RomM 5.2.0: MariaDB+Redis now required (was SQLite), auth var renamed, 11 metadata providers
- Copyparty v1.20.19: 3 CVEs fixed, WOPI integration, docker editions documented
- Calibre-Web 0.6.27-ls397: version pinning, kepubify auto-config, CVE fixes
- Calibre 9.9.0: content server security fix noted

New documentation:
- docs/Dankserver/Jellyfin.md — full media server guide (compose, Caddy, GPU, metadata, clients)
- docs/Dankserver/ARR-Stack.md — automated download stack overview
- docs/Dankserver/RomM-Scraping.md — metadata providers, naming, cover art, emulator integration
- docs/Dankserver/sonarr.md, radarr.md, lidarr.md, readarr.md, prowlarr.md, qbittorrent.md
- docs/Dankserver/mariadb.md, redis.md — supporting services for RomM

Infrastructure updates:
- dankserver/compose.yaml: added mariadb, redis, jellyfin, *arr services
- dankserver/Caddyfile: added hostnames for all new services
- dankserver/.env.example: added all new environment variables
- docs/index.md: linked all new documentation pages

Tested: 52/52 tests pass.

docs/Dankserver/qbittorrent.md

@@ -0,0 +1,52 @@
+# qBittorrent
+
+qBittorrent is the torrent download client for the *arr stack on Dankserver. It receives download requests from Sonarr, Radarr, Lidarr, and Readarr via category tagging.
+
+**Host:** Dankserver — **Hostname:** `qbittorrent.dankserver.local` — **Docs:** https://www.qbittorrent.org
+
+## Facts
+
+| Item | Value |
+|------|-------|
+| Image | `lscr.io/linuxserver/qbittorrent:latest` |
+| Port | 8080 (host) → 8080 (container) |
+| Min RAM | 512 MB |
+| Auth | Web UI username/password; LAN mode available |
+
+## Configuration
+
+1. Change the default Web UI password (Settings → Web UI).
+2. Enable "No auth mode for LAN" for arr app connectivity (Settings → Web UI → uncheck "HTTP authentication required for clients").
+3. Create download categories: `movies`, `tv`, `music`, `books`.
+4. Set max active downloads: Settings → Downloads (recommended: 5 global, 3 per category).
+
+## Docker Compose
+
+```yaml
+qbittorrent:
+  image: lscr.io/linuxserver/qbittorrent:latest
+  container_name: qbittorrent
+  restart: unless-stopped
+  environment:
+    - PUID=1000
+    - PGID=1000
+    - TZ=America/New_York
+    - UMASK_SET=022
+  volumes:
+    - /opt/qbittorrent/config:/config
+    - /mnt/media/downloads:/downloads
+    - /mnt/media/downloads/incomplete:/downloads/incomplete
+  ports:
+    - "8080:8080"
+  networks: [appnet]
+```
+
+## Gotchas
+
+- qBittorrent Web UI password changes on first run (check `config/qBittorrent.conf`).
+- Ensure umask is set to `022` so downloaded files are readable by arr apps.
+- Monitor bandwidth limits to avoid saturating the network.
+
+## See Also
+
+- [[ARR-Stack]] — full *arr stack documentation