feat(SlidevVideo): add pause segments control

[Jeffrey0117]

Description

 Add `pause` prop to `SlidevVideo` component for segment-based video playback control.

 ## Changes

 - Add `pause` prop supporting duration arrays like `[3, 5, 2, 'end']`
 - Click on video to play next segment
 - No external dependencies added
 - All existing props remain compatible

 ## Example

 ```vue
 <SlidevVideo autoplay :pause="[3, 5, 2, 'end']" controls>
   <source src="/video.mp4" type="video/mp4" />
 </SlidevVideo>

The video will:

 - Play 3 seconds → pause
 - Click to play 5 seconds → pause
 - Click to play 2 seconds → pause
 - Click to play until end

Fixes #2177

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