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/prowlarr.md

@@ -0,0 +1,55 @@
+# Prowlarr
+
+Prowlarr is the indexer management layer for the *arr stack. It aggregates indexers (torrent and Usenet) and exposes a unified API that Sonarr, Radarr, Lidarr, and Readarr consume.
+
+**Host:** Dankserver — **Hostname:** `prowlarr.dankserver.local` — **Docs:** https://wiki.servarr.com/prowlarr
+
+## Facts
+
+| Item | Value |
+|------|-------|
+| Image | `lscr.io/linuxserver/prowlarr:latest` |
+| Port | 9696 (host) → 9696 (container) |
+| Min RAM | 256 MB |
+| Auth | API key (Settings → General) |
+
+## Configuration
+
+1. Add indexers: Settings → Indexers → Add.
+2. Test each indexer with the **Test** button.
+3. Assign tags (e.g., `movies`, `tv`, `music`) to indexers for routing.
+4. Add download client: Settings → Download Clients → Add qBittorrent.
+
+## Docker Compose
+
+```yaml
+prowlarr:
+  image: lscr.io/linuxserver/prowlarr:latest
+  container_name: prowlarr
+  restart: unless-stopped
+  environment:
+    - PUID=1000
+    - PGID=1000
+    - TZ=America/New_York
+    - UMASK_SET=022
+  volumes:
+    - /opt/prowlarr/config:/config
+    - /mnt/media/downloads:/downloads:ro
+  ports:
+    - "9696:9696"
+  networks: [appnet]
+```
+
+## Gotchas
+
+- Prowlarr database grows with indexer data. Set up periodic vacuum/backup.
+- Indexer sync has a 15–60 minute delay. Search results may lag.
+- Rotate API key: update it in every arr app.
+
+## See Also
+
+- [[ARR-Stack]] — full *arr stack documentation
+- [[radarr]]
+- [[sonarr]]
+- [[lidarr]]
+- [[readarr]]