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/radarr.md

@@ -0,0 +1,54 @@
+# Radarr
+
+Radarr manages movies in the *arr stack on Dankserver. It automatically searches, downloads, and organizes movies from indexers into the Jellyfin media library.
+
+**Host:** Dankserver — **Hostname:** `radarr.dankserver.local` — **Docs:** https://wiki.servarr.com/radarr
+
+## Facts
+
+| Item | Value |
+|------|-------|
+| Image | `lscr.io/linuxserver/radarr:latest` (v4 stable) |
+| Port | 7878 (host) → 7878 (container) |
+| Min RAM | 512 MB |
+| Metadata | TMDB / TheMovieDB API |
+
+## Docker Compose
+
+```yaml
+radarr:
+  image: lscr.io/linuxserver/radarr:latest
+  container_name: radarr
+  restart: unless-stopped
+  environment:
+    - PUID=1000
+    - PGID=1000
+    - TZ=America/New_York
+    - UMASK_SET=022
+  volumes:
+    - /opt/radarr/config:/config
+    - /mnt/media/movies:/movies
+    - /mnt/media/downloads:/downloads
+  ports:
+    - "7878:7878"
+  networks: [appnet]
+```
+
+## Configuration
+
+1. Add Prowlarr as the indexer source.
+2. Add qBittorrent as the download client with the `movies` category.
+3. Set quality profile and cutoff quality.
+4. Set root folder to `/movies`.
+5. Add movies and verify downloads.
+
+## Gotchas
+
+- Radarr v4 is the current stable. `:latest` points to v4, not v5.
+- Movie renaming produces `Title (Year)` format. Jellyfin scanner handles this.
+- File permissions: qBittorrent downloads as PUID; arr apps must read/move files.
+
+## See Also
+
+- [[ARR-Stack]] — full *arr stack documentation
+- [[Jellyfin]] — media server that consumes Radarr downloads