Fix Spotify playlist ChildCount in SearchItems endpoint

The playlist list was going through SearchItems (not ProxyRequest), so
UpdateSpotifyPlaylistCounts was never called. Now updates counts in both:
- SearchItems when browsing playlists (no search term)
- ProxyRequest for other playlist list requests

This fixes playlists showing 0 tracks when they should show the count
of missing tracks available.

allstarr/Controllers/JellyfinController.cs

@@ -121,6 +121,13 @@ public class JellyfinController : ControllerBase
                 return Unauthorized(new { error = "Authentication required" });
             }
 
+            // Update Spotify playlist counts if enabled and response contains playlists
+            if (_spotifySettings.Enabled && browseResult.RootElement.TryGetProperty("Items", out var _))
+            {
+                _logger.LogInformation("Browse result has Items, checking for Spotify playlists to update counts");
+                browseResult = await UpdateSpotifyPlaylistCounts(browseResult);
+            }
+
             var result = JsonSerializer.Deserialize<object>(browseResult.RootElement.GetRawText());
             if (_logger.IsEnabled(LogLevel.Debug))
             {