Add Overseerr (snap) and Syncthing (apt) to media_stack role so they're
managed by Ansible instead of being manually installed.
- Overseerr: snap install from latest/beta channel (matches current)
- Syncthing: apt install, enable syncthing@pez systemd user service
- slskd: remove stale 'currently stopped' comment from compose file
- london-b host_vars: document snap and apt user services
Fixes PESO-106
Add the full media automation stack (sonarr, radarr, prowlarr, lidarr,
readarr, whisparr), media servers (jellyfin, plex), and supporting
services (transmission, samba, ollama, promtail, cloudflared, vsftpd)
to the repo as a media_stack Ansible role.
Includes:
- Custom systemd unit files for non-package-managed services
- Config files for promtail, samba, transmission, vsftpd
- Cron jobs for movie-rename-fix, sonarr/radarr midnight restarts
- Updated deploy.yml to wire the role into london-b's stage
- Updated london-b docs with full service inventory
Backup script (backup.sh) already covered by the existing backup role.
Node/systemd exporters already covered by existing monitoring roles.
Closes PESO-92
