Refactor code structure for improved readability and maintainability

docs/compiled/artplayer-plugin-multiple-subtitles.legacy.js

@@ -2,7 +2,7 @@
 /*!
  * artplayer-plugin-multiple-subtitles.js v1.1.0
  * Github: https://github.com/zhw2590582/ArtPlayer
- * (c) 2017-2025 Harvey Zack
+ * (c) 2017-2026 Harvey Zack
  * Released under the MIT License.
  */
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