Token-Optimierung: Prompt Caching + Tool-Result-Truncation in History

Models/ChainRecord.cs

@@ -10,6 +10,8 @@ public class ChainRecord
     public string SystemPrompt { get; set; }
     public long InputTokens { get; set; }
     public long OutputTokens { get; set; }
+    public long CacheCreationTokens { get; set; }
+    public long CacheReadTokens { get; set; }
     public int Iterations { get; set; }
     public string StopReason { get; set; }
     public long DurationMs { get; set; }