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将 getDiscount 和 isNewUserOnlyForQuantity 的匹配逻辑从 inputMonths >= discount.Quantity 改为 inputMonths == discount.Quantity, 买多少天就用多少天对应的折扣,避免错误配置导致折扣泄漏。 同时增加 discount 值合法性校验(>0 且 <100)。 Co-Authored-By: claude-flow <ruv@ruv.net>