docs: add jellyfin-services.md with arr-stack and Watchtower lscr.io auth fix

jellyfin/jellyfin-services.md

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+# Jellyfin Server — Docker Services
+
+## Host
+- **VM / alias**: jellyfin
+- **IP**: `192.168.88.10`
+- **SSH**: `jgitta@192.168.88.10` (alias: `jellyfin`)
+- **Portainer endpoint ID**: 4
+- **Compose files**: managed via Portainer (stack IDs below); source of truth is Gitea `jgitta/homelab-configs`
+
+---
+
+## Stacks
+
+| Stack | Portainer ID | Gitea Path |
+|---|---|---|
+| arr-stack | 35 | `jellyfin/arr-stack/docker-compose.yml` |
+| portainer-agent | 36 | `jellyfin/portainer-agent/` |
+| node-exporter | 44 | `jellyfin/node-exporter/` |
+
+---
+
+## arr-stack Services
+
+| Container | Image | Port | Config Path |
+|---|---|---|---|
+| radarr | lscr.io/linuxserver/radarr:latest | 7878 | /srv/docker/radarr/config |
+| sonarr | lscr.io/linuxserver/sonarr:latest | 8989 | /srv/docker/sonarr/config |
+| prowlarr | lscr.io/linuxserver/prowlarr:latest | 9696 | /srv/docker/prowlarr/config |
+| flaresolverr | ghcr.io/flaresolverr/flaresolverr:latest | 8191 | — |
+| watchtower | containrrr/watchtower | — | see below |
+
+Media volume: `/mnt/media` on jellyfin host → mounted as `/data` in radarr/sonarr.
+
+---
+
+## Watchtower
+
+- Runs inside arr-stack on jellyfin (Portainer stack 35)
+- Schedule: `0 0 4 * * *` — runs at 4:00 AM daily
+- Notifications: email via Fastmail SMTP to jgitta@jgitta.com
+- Cleanup: enabled (removes old images after update)
+- Rolling restarts: enabled with 30s timeout, 60s wait before stopping
+
+### lscr.io Authentication (fix applied 2026-05-11)
+
+**Problem**: Watchtower was hitting lscr.io's rate limiter on unauthenticated pulls. radarr,
+sonarr, and prowlarr all use `lscr.io/linuxserver/` images; when Watchtower checks them
+concurrently at 4 AM the burst briefly exceeded the anonymous quota. Error appeared in
+email notifications as:
+```
+Unable to update container "/radarr": Error response from daemon: toomanyrequests:
+retry-after: 835.12µs, allowed: 44000/minute. Proceeding to next.
+```
+Observed on: 2026-05-08 and 2026-05-11.
+
+**Fix**:
+1. Logged in to lscr.io on the jellyfin host using the GitHub PAT (credentials.md):
+   ```
+   echo <github_pat> | docker login lscr.io -u jgitta --password-stdin
+   ```
+   Creates `/home/jgitta/.docker/config.json` with lscr.io auth token.
+
+2. Mounted that config into the Watchtower container (in docker-compose.yml):
+   ```yaml
+   volumes:
+     - /var/run/docker.sock:/var/run/docker.sock
+     - /home/jgitta/.docker/config.json:/config.json:ro
+   ```
+   Watchtower reads `/config.json` inside the container for registry credentials.
+
+3. Updated Gitea (`jellyfin/arr-stack/docker-compose.yml`) and redeployed via Portainer.
+
+**If GitHub PAT expires**: Re-run the `docker login lscr.io` command on jellyfin with the
+new token. No compose changes needed — the mounted file updates automatically.
+The PAT expiry date is tracked in credentials.md / github.com/settings/tokens.