docs: improve README - #30

No actionable comments were generated in the recent review. 🎉

Walkthrough

README 新增两个开头空行，并新增 LOG_LEVEL 环境变量说明。该变量的默认值为 ERROR。

Changes

README 文档更新

Estimated code review effort: 1（极低）| ~2 分钟

Merge Risk: ⚪ Minimal · up to 1e868

This is a small, documentation-only README update with no actionable merge-blocking risk remaining; it is merge-ready after normal checks and review.

Poem

我是小兔，轻敲文档门，
两行空白迎清晨。
LOG_LEVEL 跳进配置栏，
ERROR 默认守夜深。
改动虽小，说明更完整。

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

_{Comment @coderabbitai help to get the list of available commands.}