fix(AbsAgentWebSettings): allow media playback without user gesture (#339)

Resolves #339

Issue #339 reports that an embedded video on a page loaded in AgentWeb
fails with:

  Failed to execute 'play' on 'HTMLMediaElement': API can only be initiated
  by a user gesture.

The platform default for setMediaPlaybackRequiresUserGesture is true, and
AbsAgentWebSettings.settings() never overrides it. Many embedded video
players (TikTok/Douyin share pages, Twitter video, etc.) start playback
programmatically and break under that default.

This change calls mWebSettings.setMediaPlaybackRequiresUserGesture(false)
in settings() so the platform's WebView allows programmatic playback,
matching the behavior most in-app browsers want.

The mixed-content half of the same issue (HTTP video on HTTPS page) is
already handled by the existing setMixedContentMode(MIXED_CONTENT_ALWAYS_ALLOW)
call further down in the same method.

Author: jim-daf

agentweb-core/src/main/java/com/just/agentweb/AbsAgentWebSettings.java

@@ -65,6 +65,10 @@ private void settings(WebView webView) {
         mWebSettings.setSupportZoom(true);
         mWebSettings.setBuiltInZoomControls(false);
         mWebSettings.setSavePassword(false);
+        // Issue #339: HTMLMediaElement.play() throws "API can only be initiated by
+        // a user gesture" for embedded video players that auto-play. Allow
+        // programmatic playback so embedded players (e.g. share-page videos) work.
+        mWebSettings.setMediaPlaybackRequiresUserGesture(false);
         if (AgentWebUtils.checkNetwork(webView.getContext().getApplicationContext())) {
             //根据cache-control获取数据。
             mWebSettings.setCacheMode(WebSettings.LOAD_DEFAULT);