fix(ci): skip Lark notification for fork pull requests

[luojiyin1987]

Fixes #113

改动

.github/workflows/Lark-notification.yml 的发送步骤增加 secret 判空条件。GitHub Actions 规定 if: 不能直接引用 secrets.*，所以先把 secret 是否存在映射为 job 级 env：

env:
  HAS_LARK_WEBHOOK: ${{ secrets.LARK_CHATBOT_HOOK_URL != '' }}

# ...

if: ${{ contains(steps.message.outputs.content, ':') && env.HAS_LARK_WEBHOOK == 'true' }}

fork PR 拿不到仓库 secrets 时跳过发送，不再以空 URL 调用 feishu-action 导致 No URL protocol specified、Check 变红。env 里只放布尔标志，hook URL 的暴露范围保持不变（仅 feishu-action 步骤）。

行为对照

场景	之前	之后
push / issues / discussions / release	发送	不变
仓库内分支的 PR	发送	不变
fork PR（含 review comment）	失败变红	跳过发送

不采用 pull_request_target：workflow 会执行仓库内脚本（transform-message.ts），在该事件下 checkout 外部 PR 代码并暴露 secrets 有泄露风险。

[coderabbitai]

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