feat: enforce browser environment for Artplayer initialization

- Added a check in the Artplayer constructor to throw an error if instantiated outside a browser environment.
- Updated the isBrowser utility to ensure both window and document are defined.
- Removed unused user agent checks for WeChat, IE, and Android from compatibility utilities.
- Updated TypeScript definitions to reflect the removal of unused properties.
- Added a basic test case for Artplayer initialization in SSR context.

test/ssr.test.js

@@ -1,3 +1,8 @@
 import Artplayer from '../packages/artplayer/dist/artplayer.js'
 
 console.log(Artplayer.default.html)
+
+const art = new Artplayer.default({
+  container: '.artplayer-app',
+  url: './assets/sample/video.mp4',
+})