fix: add missing newline at end of localization files

- Ensured proper formatting by adding a newline at the end of the English and Chinese localization JSON files.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/locales/en.json

@@ -72,4 +72,4 @@
   "多视频监控": "Multi-Video Monitoring",
   "新建标签": "New Tab",
   "Stream 管理": "Stream Management"
-}
+}

src/locales/zh-cn.json

@@ -72,4 +72,4 @@
   "多视频监控": "多视频监控",
   "新建标签": "新建标签",
   "Stream 管理": "Stream 管理"
-}
+}