f3s/beets-art: nightly k3s CronJob to fetch+embed cover art for Navidrome

Adds a beets-based CronJob that runs every night on r1 (where the
Navidrome music PVC lives), fetching external cover.jpg into each album
folder and embedding art into audio files. Idempotent on re-runs:

  - import.incremental skips already-known album folders
  - fetchart skips albums that already have cover art
  - embedart with ifempty:no + compare_threshold:50 only fills missing
    embeds and refuses risky overwrites

Navidrome picks new art up via its existing 1h scan; no Navidrome change
required. Reuses navidrome-music-pvc directly (RWO is fine because both
pods pin to r1 via nodeSelector). State (library.db, logs) lives on a
small local-path PVC, regenerable by deleting the PVC.

Files: f3s/beets-art/helm-chart/{Chart.yaml,README.md,templates/*.yaml}
  f3s/beets-art/Justfile  (status, logs, run-now, suspend, resume, shell)
  f3s/argocd-apps/services/beets-art.yaml
Amp-Thread-ID: https://ampcode.com/threads/T-019e223a-d137-705e-879b-84130c0e78ea
Co-authored-by: Amp <amp@ampcode.com>

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