fix: address code review findings

- notifier: show artist display names (not internal IDs) in digest; resolve
  names from artist_settings and fall back to ID when unavailable
- notifier: skip sending an empty digest to avoid daily spam
- config: require telegram token/chat_id when enabled
- web: warn loudly when auth is disabled on a non-loopback bind; add HTTP
  server timeouts
- web: treat SetReleaseIgnored "release not found" as benign redirect (0 rows)
- musicbrainz: reject low-score/name-mismatched MBID resolutions instead of
  silently caching the wrong artist
- database: remove dead duplicate err check; harden DSN param appending
- musicbrainz: check rows.Err() after iterating existing releases

internal/musicbrainz/sync.go

@@ -114,6 +114,10 @@ func SyncArtistDiscography(
 		}
 		ignoredMap[rgid] = ignored
 	}
+	if err := rows.Err(); err != nil {
+		rows.Close()
+		return nil, fmt.Errorf("sync artist discography: iterate existing releases: %w", err)
+	}
 	rows.Close()
 
 	// Build the set of RGIDs present in this sync so we can drop only the rows