dankserver: quadlet units + deploy handlers for romm trio, jellyfin, calibre-web, copyparty

Cutover of the six surviving dankserver services from compose-era bare
containers to boot-persistent Quadlet units (WantedBy=default.target; podman
5.x v1 generator honors it at user-manager start).

Units are faithful to live inspect ground truth (image pins = running tags,
not compose inventory):
- romm trio shares one data root: /home/dank/Containers/romm mounted whole at
  /romm; mariadb datadir and redis data dir live inside it. Aliases mariadb/
  redis preserved on dankserver_appnet via Network=...:alias=. Secrets stay in
  the host-local env file (EnvironmentFile + ${VAR} expansion in the generated
  ExecStart, gitea precedent). copyparty passes its admin account via
  Exec=-a ${COPAY_ACCOUNT}:${COPAY_PASSWORD} (Exec= not Command=: the v1
  generator hard-fails on Command=); entropy stays rw only there.
- jellyfin keeps every creation-time env as Environment= lines (zero drift);
  Device=/dev/dri + GroupAdd=keep-groups preserve hardware transcoding.
- calibre-web pins the exact running image tag (id 986277563e76 =
  0.6.27-ls397), pasta network preserved.

Deployer: first-cutover handlers retire the old container, rescue unshadowed
anonymous-volume content (podman volume export + tar --skip-old-files), mv
data roots on the same fs, then start units in dependency order with health
gates. Re-deploys restart only the selected unit. deploy-plan.py maps compose
keys mariadb/redis to the new unit names; allowlists updated. New seam test
tests/dankserver_quadlet.bats pins boot-persistence + v1-generator contract;
test-changed.sh maps the new dirs to it. Full suite green (209 tests).

dankserver/jellyfin/quadlet/jellyfin.container

@@ -0,0 +1,58 @@
+# Quadlet unit: Jellyfin media server (rootless, boot-persistent).
+#
+# Install path on dankserver: ~/.config/containers/systemd/jellyfin.container
+# Unit name: jellyfin.service (podman 5.x drops the container- prefix)
+#
+# Data roots migrated from /opt/jellyfin to /home/dank/Containers/jellyfin at
+# cutover. The entropy volume is mounted read-only: nothing automated ever
+# writes there; copyparty is the only write path for /mnt/entropy. Every
+# creation-time environment variable of the compose-era container is kept as
+# an Environment= line (zero drift); none of them are secrets, so this unit
+# needs no EnvironmentFile.
+
+[Unit]
+Description=Jellyfin media server container
+After=network.target
+
+[Container]
+ContainerName=jellyfin
+Image=ghcr.io/jellyfin/jellyfin:latest
+Network=dankserver_appnet
+Environment=DEBIAN_FRONTEND=noninteractive
+Environment=DOTNET_SYSTEM_IO_DISABLEFILELOCKING=true
+Environment=JELLYFIN_CACHE_DIR=/cache
+Environment=JELLYFIN_CONFIG_DIR=/config/config
+Environment=JELLYFIN_DATA_DIR=/config
+Environment=JELLYFIN_FFMPEG=/usr/lib/jellyfin-ffmpeg/ffmpeg
+Environment=JELLYFIN_LOG_DIR=/config/log
+Environment=JELLYFIN_PublishedServerUrl=http://192.168.0.235:8096
+Environment=JELLYFIN_WEB_DIR=/jellyfin/jellyfin-web
+Environment=LANG=en_US.UTF-8
+Environment=LANGUAGE=en_US:en
+Environment=LC_ALL=en_US.UTF-8
+Environment=LD_PRELOAD=/usr/lib/jellyfin/libjemalloc.so.2
+Environment=MALLOC_TRIM_THRESHOLD_=131072
+Environment=NVIDIA_DRIVER_CAPABILITIES=compute,video,utility
+Environment=NVIDIA_VISIBLE_DEVICES=all
+Environment=XDG_CACHE_HOME=/cache
+PublishPort=8096:8096
+PublishPort=8920:8920
+PublishPort=7359:7359/udp
+PublishPort=1900:1900/udp
+Volume=/home/dank/Containers/jellyfin/config:/config
+Volume=/home/dank/Containers/jellyfin/cache:/cache
+Volume=/mnt/entropy/Movies:/data/movies:ro
+Volume=/mnt/entropy/TVShows:/data/shows:ro
+Device=/dev/dri
+GroupAdd=keep-groups
+HealthCmd=curl -f http://localhost:8096/health
+HealthInterval=30s
+HealthTimeout=10s
+HealthRetries=3
+
+[Service]
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=default.target