docs: 新增 Git 提交規範至 CLAUDE.md

[Showchen168]

Summary

• 定義標準 PR 工作流程
• 新增提交訊息格式規範
• 定義 commit type 類型說明

Test plan

• 確認 CLAUDE.md 格式正確

🤖 Generated with Claude Code

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

• 🔍 Trigger a full review

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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