chore(docs): added cover for DevLog 2026.01.01 (#876)

docs/content/en/blog/DevLog-2026.01.01/index.md

@@ -5,7 +5,8 @@ date: 2026-01-01
 excerpt: |
   Sharing AIRI's progress on the iOS platform, the problems we encountered and their solutions, as well as some achievements and implementation details of the memory layer experiments in FlowChat by LemonNeko.
 preview-cover:
-# TODO
+  light: "@assets('./assets/cover-light.png')"
+  dark: "@assets('./assets/cover-dark.png')"
 ---
 
 ::: info AI Translation
@@ -127,3 +128,5 @@ I wonder if you noticed something—when I introduced the steps, I said "concate
 Alright, the first DevLog of this year has been ~~phoned in~~ written by me. I hope you enjoyed reading it.
 
 See you in the next DevLog.
+
+*Cover image generated by [Google Gemini](https://gemini.google.com/)*

docs/content/zh-Hans/blog/DevLog-2026.01.01/index.md

@@ -5,7 +5,8 @@ date: 2026-01-01
 excerpt: |
   和大家分享 AIRI 在 iOS 平台上的进展，遇到的问题与解决方案，以及柠猫在 FlowChat 实验记忆层的一些成果和一点点实现细节。
 preview-cover:
-# TODO
+  light: "@assets('./assets/cover-light.png')"
+  dark: "@assets('./assets/cover-dark.png')"
 ---
 
 新年快乐！这里是 [@LemonNekoGH](https://github.com/LemonNekoGH)，AIRI 的维护者之一，新年的第一篇 DevLog 是我的了，（按下 B 键选择了大笑表情）啊哈哈哈哈哈哈！
@@ -123,3 +124,5 @@ const props = defineProps<{
 好的，今年第一篇 DevLog 就被我 ~~水~~ 写好了，希望你看得开心。
 
 我们下一篇 DevLog 再见。
+
+*封面图由 [Google Gemini](https://gemini.google.com/) 生成*