fix(docs): update MiniMax plugin URL from legacy moltbot org

Author: sfo2001

docs/providers/minimax.md

@@ -53,7 +53,7 @@ You will be prompted to select an endpoint:
 - **Global** - International users (`api.minimax.io`)
 - **CN** - Users in China (`api.minimaxi.com`)
 
-See [MiniMax OAuth plugin README](https://github.com/moltbot/moltbot/tree/main/extensions/minimax-portal-auth) for details.
+See [MiniMax OAuth plugin README](https://github.com/openclaw/openclaw/tree/main/extensions/minimax-portal-auth) for details.
 
 ### MiniMax M2.1 (API key)