⚡ Bolt: Optimize GregAPI.GetRackCount by using NetworkMap.GetNumberOfDevices()

[mleem97]

💡 What: Replaced the expensive O(N) UnityEngine.Object.FindObjectsOfType<Il2Cpp.Rack>() call in GregAPI.GetRackCount() with O(1) lookup using Il2Cpp.NetworkMap.instance.GetNumberOfDevices()[2]. Included a fallback for safety during uninitialized states.
🎯 Why: FindObjectsOfType searches the entire Unity hierarchy and creates GC allocations which degrades performance when frequently polled, especially with many devices.
📊 Impact: Expected to reduce CPU time and garbage collection hitches when the API is polled for rack counts.
🔬 Measurement: Verify via in-game performance profiler that polling rack counts uses negligible CPU time compared to before.

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PR created automatically by Jules for task 6848807328765113267 started by @mleem97

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