feat: add video thumbnail image to post 266 "Masked Sculpture"

Author: tw93

src/pages/en/posts/266-Masked-Sculpture.md

@@ -66,6 +66,8 @@ Last month I gave a session at work for product and business folks on how to get
 <https://www.youtube.com/watch?v=Z5If1L3eFtw>
 Finally uploaded to YouTube. If you read the article and did not fully follow it, or want a deeper look, the video version is up. New to YouTube here, so please like, subscribe, and share. From now on I will try to record more sessions and share them here.
 
+<img src="https://gw.alipayobjects.com/zos/k/bp/SCR-20260423-tuzj.jpeg" width="800" />
+
 The [slides](https://tw93.fun/files/share/agent.html) are also fun. They are the predecessor of Kami. Kami started as a small investment report generator I was tinkering with inside CC. Around the same time I had a session about agents to give, and writing such a long deck felt tedious, so I just used the existing capability to generate and tweak versions until I was satisfied. That is how Kami was born. Welcome to read.
 
 **Moments of Happiness**

src/pages/posts/266-口罩雕塑.md

@@ -66,6 +66,8 @@ Mole 是家里的小宠物鼹鼠，某年在三亚泳池边游泳带回家的，
 <https://www.youtube.com/watch?v=Z5If1L3eFtw>
 终于传到 Youtube 去了，上次看文章的小伙伴假如没有看太懂的，或者想更加了解的，欢迎看视频，Youtuber 视频小白欢迎大家一键三连加关注，以后我尽量把分享都录屏分享给大伙在这里看看。
 
+<img src="https://gw.alipayobjects.com/zos/k/bp/SCR-20260423-tuzj.jpeg" width="800" />
+
 这个[分享文稿](https://tw93.fun/files/share/agent.html)也非常有意思，是 Kami 的前身。Kami 最开始是我在 CC 里面的一个投资报告生成小玩意，然后刚好有一个分享要讲你不知道的 Agent，很懒感觉写一个这么长的 PPT 多费时间啊，然后就直接把原来能力边生成边调试几个版本到满意状态，然后 Kami 就出生了，欢迎阅读。
 
 **幸福瞬间**