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/readarr.md

@@ -0,0 +1,55 @@
+# Readarr
+
+Readarr manages ebooks and audiobooks in the *arr stack on Dankserver. It automatically searches, downloads, and organizes books into the Calibre library.
+
+**Host:** Dankserver — **Hostname:** `readarr.dankserver.local` — **Docs:** https://wiki.servarr.com/readarr
+
+## Facts
+
+| Item | Value |
+|------|-------|
+| Image | `lscr.io/linuxserver/readarr:latest` (v0.2.x development) |
+| Port | 8787 (host) → 8787 (container) |
+| Min RAM | 256 MB |
+| Metadata | Goodreads / StoryGraph |
+
+## Docker Compose
+
+```yaml
+readarr:
+  image: lscr.io/linuxserver/readarr:latest
+  container_name: readarr
+  restart: unless-stopped
+  environment:
+    - PUID=1000
+    - PGID=1000
+    - TZ=America/New_York
+    - UMASK_SET=022
+  volumes:
+    - /opt/readarr/config:/config
+    - /mnt/media/books:/books
+    - /mnt/media/downloads:/downloads
+  ports:
+    - "8787:8787"
+  networks: [appnet]
+```
+
+## Configuration
+
+1. Add Prowlarr as the indexer source (torrent indexers with book content).
+2. Add qBittorrent as the download client with the `books` category.
+3. Set author profile (format preference: epub, mobi, etc.).
+4. Set quality profile for audiobooks (320 kbps MP3, 128 kbps, lossless).
+5. Set root folder to `/books`.
+6. Add authors and verify downloads.
+
+## Gotchas
+
+- Readarr is in development (~v0.2.x). Some features may be incomplete.
+- Calibre integration is folder-based, not API-based. Readarr drops files into `/books` which Calibre-Web serves.
+- Not all indexers have all formats (epub, mobi, pdf). Goodreads/StoryGraph metadata helps match editions.
+
+## See Also
+
+- [[ARR-Stack]] — full *arr stack documentation
+- [[Calibre-Web]] — ebook web frontend that serves Readarr downloads