Sprite mirror

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Issue 內文只包含功能請求範本，沒有指出檔案、測試或進入點。首先釐清 sprite 鏡像應實現什麼功能、涉及哪個 rendering 或 sprite API，以及將如何驗證完成情況。只有在明確範圍和驗收標準後，工作才能開始。

由索引模型根據 Issue 內容生成。