Add rate limiting delays to prevent Spotify 429 errors

- Increase delay between playlist fetches from 1s to 3s
- Only delay between playlists, not after the last one
- Add debug logging for rate limit delays
- Spotify is very aggressive with rate limiting on their API

allstarr/Services/Spotify/SpotifyPlaylistFetcher.cs

@@ -297,8 +297,13 @@ public class SpotifyPlaylistFetcher : BackgroundService
                 _logger.LogError(ex, "Error fetching playlist '{Name}'", config.Name);
             }
             
-            // Rate limiting between playlists
+            // Rate limiting between playlists - Spotify is VERY aggressive with rate limiting
-            await Task.Delay(_spotifyApiSettings.RateLimitDelayMs, cancellationToken);
+            // Wait 3 seconds between each playlist to avoid 429 TooManyRequests errors
+            if (config != _spotifyImportSettings.Playlists.Last())
+            {
+                _logger.LogDebug("Waiting 3 seconds before next playlist to avoid rate limits...");
+                await Task.Delay(TimeSpan.FromSeconds(3), cancellationToken);
+            }
         }
         
         _logger.LogInformation("=== FINISHED FETCHING SPOTIFY PLAYLISTS ===");