⚡ Bolt: [Performance optimization] Use O(1) device count lookup for racks in API module

[mleem97]

💡 What: Replaced expensive UnityEngine.Object.FindObjectsOfType<global::Il2Cpp.Rack>() with global::Il2Cpp.NetworkMap.instance.GetNumberOfDevices() in GregFacilityModule.GetRackCount().
🎯 Why: FindObjectsOfType is O(N) over all loaded objects and blocks the main thread, wasting CPU cycles when polled frequently.
📊 Impact: Substantially reduces CPU usage when mods query the rack count, scaling to large environments efficiently.
🔬 Measurement: Observe reduction in CPU hitches when API consumers poll for facility metrics.

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PR created automatically by Jules for task 641346162784023045 started by @mleem97

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