Better Mob Combat Fix [BMCFIX]

Added

• Second mixin to fix Pehkui integration
• BMCPehkuiHelperMixin overwrites BMCPehkuiHelper.load() method

Fixed

• NoClassDefFoundError: net/bettercombat/compatibility/PehkuiHelper when Pehkui mod is installed
• Pehkui scale integration now works correctly with Better Combat 1.9.0

Technical

• Uses @Overwrite mixin for BMCPehkuiHelper.load() method
• Replaces entire method to use net.bettercombat.client.compat.PehkuiHelper instead of old package
• MixinPlugin now conditionally applies both mixins