feat: payload logging (on/off + gzip) via appsettings + fix destroy messages ref

Program.cs

@@ -35,10 +35,13 @@ builder.Services.AddSingleton(chatService);
 
 // AnthropicService (Singleton – shared zwischen ChatEndpoint und TelegramService)
 var anthropicToken = builder.Configuration["AnthropicToken"] ?? "";
+var payloadLogging = builder.Configuration.GetValue<bool>("PayloadLogging", false);
+var payloadLoggingGzip = builder.Configuration.GetValue<bool>("PayloadLoggingGzip", false);
 builder.Services.AddSingleton<AnthropicService>(sp =>
     new AnthropicService(
         sp.GetRequiredService<IHttpClientFactory>(),
-        anthropicToken, toolService, dbService, memoryService));
+        anthropicToken, toolService, dbService, memoryService,
+        payloadLogging, payloadLoggingGzip));
 
 // Telegram Bot (pro Session – Token aus Session-Config)
 var maxIterations = builder.Configuration.GetValue<int>("MaxIterations", 100);