Basic JavaScriptFamiliarity with Luckysheet cell format system
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
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研究方向
Explore the existing cell format implementation in Luckysheet, likely in the source code under src or similar. Find how other number formats (like currency, percentage) are defined and rendered. Add a new format for Chinese uppercase numbers by following the same pattern. Look for files related to cell formatting, possibly in the 'format' or 'cell' directories. Since no comments or linked PRs exist, the approach is to understand the codebase and implement the feature incrementally.
