feat(ops): make openai token stats optional

backend/internal/service/ops_settings.go

@@ -371,6 +371,7 @@ func defaultOpsAdvancedSettings() *OpsAdvancedSettings {
 		IgnoreCountTokensErrors:   true,  // count_tokens 404 是预期行为，默认忽略
 		IgnoreContextCanceled:     true,  // Default to true - client disconnects are not errors
 		IgnoreNoAvailableAccounts: false, // Default to false - this is a real routing issue
+		DisplayOpenAITokenStats:   false,
 		AutoRefreshEnabled:        false,
 		AutoRefreshIntervalSec:    30,
 	}