纯血Pure Blood概率修改
修改了纯血特质的遗传概率，单亲为50%，双亲100%
修改了开局自定义人物时纯血特质所需点数为0
The genetic probability of the pure blood trait has been adjusted, with a 50% chance of inheritance from a single parent and a 100% chance when both parents possess the trait.
The cost of the pure blood trait required for customizing characters at the beginning of the game has been modified to 0 points.
