refactor: remove global window assignment for Artplayer and template export

- Removed the assignment of Artplayer to the global window object in index.js of the artplayer package.
- Eliminated the window export for the template plugin in index.js, streamlining the code and reducing global scope pollution.

docs/uncompiled/artplayer/index.js

@@ -4991,7 +4991,6 @@ ${line.text}`;
   Artplayer2.USE_RAF = false;
   Artplayer2.REMOVE_SRC_WHEN_DESTROY = true;
   if (isBrowser) {
-    window.Artplayer = Artplayer2;
     setStyleText("artplayer-style", style);
     setTimeout(() => {
       if (Artplayer2.LOG_VERSION) {