feat: 优化视频播放器控制体验

- 移除视频中央的播放/暂停按钮，避免遮挡画面
- 将播放控制集成到底部进度条区域（play-btn-position='bottom'）
- 优化播放结束提示为弱提示（移除图标，缩短显示时间）

优化用户观看体验，提供更沉浸式的视频播放效果。

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

@@ -14,14 +14,14 @@
         :controls="true"
         :controls="true"
         :loop="false"
         :loop="false"
         :muted="false"
         :muted="false"
-        :show-center-play-btn="true"
+        :show-center-play-btn="false"
         :show-play-btn="true"
         :show-play-btn="true"
         :enable-progress-gesture="true"
         :enable-progress-gesture="true"
         :object-fit="'contain'"
         :object-fit="'contain'"
         :show-mute-btn="true"
         :show-mute-btn="true"
         :show-fullscreen-btn="true"
         :show-fullscreen-btn="true"
         :show-screen-lock-button="true"
         :show-screen-lock-button="true"
-        :play-btn-position="'center'"
+        :play-btn-position="'bottom'"
         class="video-player"
         class="video-player"
         @loadedmetadata="onLoadedMetadata"
         @loadedmetadata="onLoadedMetadata"
         @canplay="onCanPlay"
         @canplay="onCanPlay"
@@ -181,8 +181,8 @@ const onEnded = () => {
   console.log('视频播放结束')
   console.log('视频播放结束')
   showToast({
   showToast({
     title: '播放结束',
     title: '播放结束',
-    icon: 'success',
-    duration: 1500
+    icon: 'none',
+    duration: 1000
   })
   })
 }
 }