feat(ansible): add Jellyfin service and improve deployment

- Add Jellyfin backend to HAProxy configuration on titania.incus
- Simplify deployment by using community.docker.docker_compose_v2 module
- Consolidate handlers and remove redundant Docker commands
- Update Jellyfin systemd service from oneshot to simple type
- Remove PUID/PGID environment variables from docker-compose template

ansible/jellyfin/jellyfin.service.j2

@@ -5,14 +5,13 @@ After=docker.service
 Requires=docker.service
 
 [Service]
-Type=oneshot
-RemainAfterExit=yes
+Type=simple
 WorkingDirectory={{ jellyfin_directory }}
 User={{ jellyfin_user }}
-ExecStart=/usr/bin/docker compose up -d
+ExecStart=/usr/bin/docker compose up --remove-orphans
 ExecStop=/usr/bin/docker compose down
 Restart=on-failure
 RestartSec=30
 
 [Install]
-WantedBy=default.target
+WantedBy=multi-user.target