feat(前端功能): 修复PDF打印事件监听的权限兼容问题

assets/webui/ofdgo.js

@@ -1362,7 +1362,7 @@ function printPDF(bytes, openSeq) {
 				return;
 			}
 			try {
-				frame.contentWindow.addEventListener("afterprint", clear, { once: true });
+				frame.contentDocument?.defaultView.addEventListener("afterprint", clear, { once: true });
 				frame.contentWindow.print();
 				resolve();
 			} catch {