doc: add zen deprecated models

Author: fwang

packages/web/src/content/docs/zen.mdx

@@ -192,6 +192,19 @@ charging you more than $20 if your balance goes below $5.
 
 ---
 
+### Deprecated models
+
+| Model            | Deprecation date |
+| ---------------- | ---------------- |
+| Qwen3 Coder 480B | Feb 6, 2026      |
+| Kimi K2 Thinking | March 6, 2026    |
+| Kimi K2          | March 6, 2026    |
+| MiniMax M2.1     | March 15, 2026   |
+| GLM 4.7          | March 15, 2026   |
+| GLM 4.6          | March 15, 2026   |
+
+---
+
 ## Privacy
 
 All our models are hosted in the US. Our providers follow a zero-retention policy and do not use your data for model training, with the following exceptions: