docs: add zh-CN link to notification format note (#11)

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Pigbibi

docs/notification_format.md

@@ -1,5 +1,7 @@
 # Intelligent Advisory Notification Format
 
+[简体中文](notification_format.zh-CN.md)
+
 ## Implemented Channels
 
 - GitHub Pages: `.github/workflows/publish_advisory_site.yml` publishes HTML,