ci: 更新工作流中的API密钥和模型配置

将DEEPSEEK_API_KEY替换为OPENCODE_API_KEY，并将模型从deepseek-chat更改为opencode的kimi-k2.5-free

Author: baicaizhale

.github/workflows/opencode.yml

@@ -28,6 +28,6 @@ jobs:
       - name: Run opencode
         uses: anomalyco/opencode/github@latest
         env:
-          DEEPSEEK_API_KEY: ${{ secrets.DEEPSEEK_API_KEY }}
+          OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
         with:
-          model: deepseek/deepseek-chat
+          model: opencode/kimi-k2.5-free