feat(ai): 添加学习记录排行榜功能

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yesterday a12b838f8e8555671d0752cd85e8e2ce9d208429

 src/main/java/cc/mrbird/febs/mall/entity/MallGoodsCoupon.java

@@ -26,5 +26,4 @@
    //减免金额
    private BigDecimal realAmount;


}