feat(player): optionally follow the server's per-episode track selections

With the new playback setting enabled, episode advance carries no audio or
subtitle preference at all, so both resolve from the streams selected on
the server for each individual episode. This serves setups that curate
selections server-side (e.g. Plex Auto Languages) and is independent of
"Remember track selections", which keeps gating only the write-back of
manual changes.

close #1717

lib/i18n/zh.i18n.json

@@ -168,6 +168,8 @@
     "minutesUnit": "${minutes} 分钟",
     "rememberTrackSelections": "记住每部剧集或电影的音轨选择",
     "rememberTrackSelectionsDescription": "分别记住每部内容的音频和字幕选择",
+    "followServerTrackSelections": "使用服务器为每集选择的轨道",
+    "followServerTrackSelectionsDescription": "切换剧集时，应用服务器上为该集选择的音频和字幕，而不是沿用当前选择",
     "showChapterMarkersOnTimeline": "在进度条上显示章节标记",
     "showChapterMarkersOnTimelineDescription": "按章节边界分段显示进度条",
     "clickVideoTogglesPlayback": "点击视频可切换播放/暂停",