ver1.7.1.2　Fixed Same-VTuber SSR Fusion Display + Skill System Update

■ Fixed the display for same-VTuber SSR fusion rate.
Corrected the description as shown below:

Before:
Great Success　SSR × SSR = UR　49%
After:
Great Success　SSR × SSR = SSR　49%

■ Updated the skill system code.
Adjusted the internal program in preparation for future updates.
No changes to skill effects or gameplay.