feat: add missing environment variable for Claude triage action

Author: Aias00

.github/workflows/issue-triage.yml

@@ -36,6 +36,7 @@ jobs:
       - name: Triage issue with Claude
         uses: anthropics/claude-code-action@v1
         env:
+          ANTHROPIC_BASE_URL: "https://open.bigmodel.cn/api/anthropic"
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
         with:
           prompt: |