fix: 改进 GitHub Actions 工作流，处理重复 tag 和 npm 版本问题

- 添加 tag 存在性检查，避免重复创建 git tag
- 添加 npm 版本存在性检查，避免重复发布
- 改进错误处理和日志输出
- 优化 npm 认证配置

Author: pomelo-nwu

.github/workflows/npm-publish.yml

@@ -37,13 +37,27 @@ jobs:
         run: |
           git config --local user.email "${{ github.actor }}@users.noreply.github.com"
           git config --local user.name "${{ github.actor }}"
-          git tag v${{ steps.version.outputs.version }}
-          git push origin v${{ steps.version.outputs.version }}
+          TAG_NAME="v${{ steps.version.outputs.version }}"
+          if git rev-parse "$TAG_NAME" >/dev/null 2>&1; then
+            echo "Tag $TAG_NAME already exists, skipping tag creation"
+          else
+            echo "Creating tag $TAG_NAME"
+            git tag "$TAG_NAME"
+            git push origin "$TAG_NAME"
+          fi
 
       - name: Publish
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
         run: |
           echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > ~/.npmrc
-          npm publish
+          npm publish || {
+            if [[ $? -eq 1 && $(npm view @dashscope-js/claude-code-config@${{ steps.version.outputs.version }} version 2>/dev/null) == "${{ steps.version.outputs.version }}" ]]; then
+              echo "Version ${{ steps.version.outputs.version }} already exists on npm, skipping publish"
+              exit 0
+            else
+              echo "Publish failed with error code $?"
+              exit 1
+            fi
+          }