Bug: No member named 'SetStatFlatModifier' in 'Creature'

### Current Behaviour

When trying to recompile after adding mod-autobalance to Azeroth core I get the following error during make -j$BUILD_CORES step:
/home/shewitt/azerothcore/modules/mod-autobalance/src/ABAllCreatureScript.cpp:1200:15: fatal error: no member named 'SetStatFlatModifier' in 'Creature'

I'm on Linux
I have no other modules installed
AzerothCore was cloned from GitHub in October

### Expected Behaviour

Azerothcore should recompile without errors

### Steps to reproduce the problem

1. Added mod-autobalance to the modules folder for Azerothcore
2. Run cmake command from Linux Core Installation instructions
3. Run make -j$BUILD_CORES
4. Observe error

### Extra Notes

_No response_

### AutoBalance Debug Commands

_No response_

### AC rev. hash/commit

I don't know

### Operating system

Ubuntu Server 24.04.3 LTS

### Custom changes or Modules

_No response_

Start at modules/mod-autobalance/src/ABAllCreatureScript.cpp:1200 and reproduce the failure with the documented CMake and make steps on Linux. Compare the module's expected Creature API with the checked-out AzerothCore revision, then verify that a compatible build completes without the SetStatFlatModifier error.

Written by the indexing model from the issue text.