Revert "feat: Deezer artist photo fallback for local artists with no Navidrome image"

This reverts commit 569af968c5.

CHANGELOG.md

@@ -80,7 +80,6 @@ Big change: **the entire metadata/search stack moved from Apple's iTunes to Deez
 
 ### Fixed
 - **Web + Android** — Owned albums were wrongly shown as **"Unvollständig  1 / 0 Tracks"** on the artist page. Deezer's `/artist/{id}/albums` list omits `nb_tracks`, so the total read as 0 and every matched album looked incomplete. Web now resolves the real track count from the Deezer album endpoint for **matched (owned) albums only** and treats an unknown total as complete; Android treats an unknown total as complete (never a false partial)
-- **Web + Android** — Local Navidrome artist pages with **no artist image** (niche artists like N!GHT that Navidrome's metadata agents have no art for) showed a blank hero. They now fall back to the **matched Deezer artist photo** (Navidrome image → Deezer photo → album cover)
 
 ### Notes
 - Deploy: `git pull`, then rebuild the frontend (`docker compose up -d --build novasonic-frontend`) and restart the backend (`docker compose restart novasonic-backend`). Service worker bumped to `ns-v54`