feat: add auto-injection flag for tools and filter auto-injected tools in UI

internal/pkg/toolx/builtin_tools.go

@@ -11,3 +11,7 @@ const (
 	BuiltinCreateTicketConfirmToolTitle       = "创建工单并发起确认"
 	BuiltinCreateTicketConfirmToolDescription = "当用户明确要求创建工单，且标题和描述已经整理清楚后调用。工具会先向用户确认，确认后才真正创建工单。"
 )
+
+func IsAutoInjectedToolCode(toolCode string) bool {
+	return toolCode == BuiltinToolSearchToolCode
+}