Add MusicBrainz genre enrichment and improve track counting

- Fixed external track detection (check for provider prefix in ID)
- Added genre support to MusicBrainz service (inc=genres+tags)
- Created GenreEnrichmentService for async genre lookup with caching
- Show provider name and search query for external tracks in admin UI
- Display search query that will be used for external track streaming
- Aggregate playlist genres from track genres
- All 225 tests passing

allstarr/wwwroot/index.html

@@ -1720,7 +1720,8 @@
                     if (t.isLocal === true) {
                         statusBadge = '<span class="status-badge success" style="font-size:0.75rem;padding:2px 8px;margin-left:8px;"><span class="status-dot"></span>Local</span>';
                     } else if (t.isLocal === false) {
-                        statusBadge = '<span class="status-badge warning" style="font-size:0.75rem;padding:2px 8px;margin-left:8px;"><span class="status-dot"></span>External</span>';
+                        const provider = t.externalProvider || 'External';
+                        statusBadge = `<span class="status-badge warning" style="font-size:0.75rem;padding:2px 8px;margin-left:8px;"><span class="status-dot"></span>${escapeHtml(provider)}</span>`;
                         // Add manual map button for external tracks using data attributes
                         const firstArtist = (t.artists && t.artists.length > 0) ? t.artists[0] : '';
                         mapButton = `<button class="small map-track-btn" 
@@ -1742,6 +1743,7 @@
                             <div class="track-meta">
                                 ${t.album ? escapeHtml(t.album) : ''}
                                 ${t.isrc ? '<br><small>ISRC: ' + t.isrc + '</small>' : ''}
+                                ${t.isLocal === false && t.searchQuery ? '<br><small style="color:var(--accent)">🔍 Search: ' + escapeHtml(t.searchQuery) + '</small>' : ''}
                             </div>
                         </div>
                     `;