Similar Artists orb: wire it into the WebSocket status broadcast (the real fix)

THE root cause of 'orb frozen, click does nothing visibly': when a socket is
connected, the orbs don't poll — update*Status() bails on socketConnected and
relies on server pushes. similar_artists was missing from BOTH the server emit
loop (_emit_enrichment_status_loop's workers dict) and the client dispatch
(core.js socket.on('enrichment:<id>')), so the orb never received status → never
updated. Clicks DID pause the backend (modal showed paused), but the orb visual
was frozen. Added the worker to the emit loop + the socket.on handler.

web_server.py

@@ -34761,6 +34761,7 @@ def _emit_enrichment_status_loop():
         'tidal-enrichment': lambda: tidal_enrichment_worker,
         'qobuz-enrichment': lambda: qobuz_enrichment_worker,
         'amazon-enrichment': lambda: amazon_worker,
+        'similar_artists': lambda: similar_artists_worker,
         'hydrabase': lambda: hydrabase_worker,
         'soulid': lambda: soulid_worker,
         'listening-stats': lambda: listening_stats_worker,

webui/static/core.js

@@ -459,6 +459,7 @@ function initializeWebSocket() {
     socket.on('enrichment:tidal-enrichment', (data) => updateTidalEnrichmentStatusFromData(data));
     socket.on('enrichment:qobuz-enrichment', (data) => updateQobuzEnrichmentStatusFromData(data));
     socket.on('enrichment:amazon-enrichment', (data) => updateAmazonEnrichmentStatusFromData(data));
+    socket.on('enrichment:similar_artists', (data) => updateSimilarArtistsEnrichmentStatusFromData(data));
     socket.on('enrichment:hydrabase', (data) => updateHydrabaseStatusFromData(data));
     socket.on('enrichment:repair', (data) => updateRepairStatusFromData(data));
     socket.on('enrichment:soulid', (data) => updateSoulIDStatusFromData(data));