Fix setting GPU behaviour:

Condition	maxSlotsPerGpu	Behavior
OptimizeModelStr	0	Bypass: non-shared temporary engine
1 GPU	1	Single slot, no round-robin
>1 GPU, VRAM < 24 GB	1	Round-robin: 1 slot per GPU
>1 GPU, VRAM >= 24 GB	-1	Elastic: on-demand slot growth

modules/ANSFR/ANSFaceRecognizer.h

@@ -120,7 +120,7 @@ namespace ANSCENTER {
         std::shared_ptr<Engine<float>> m_trtEngine = nullptr; // NVIDIA TensorRT
         EnginePoolManager<float>::PoolKey m_poolKey;
         bool m_usingSharedPool = false;
-        int m_maxSlotsPerGpu{ -1 };  // -1 = elastic mode (on-demand slots, auto-cleanup)
+        int m_maxSlotsPerGpu{ 1 };   // 1 = single slot (default); set by dllmain based on GPU topology
         void SetMaxSlotsPerGpu(int n) override { m_maxSlotsPerGpu = n; }
         std::shared_ptr<faiss::IndexIDMap> faiss_index;
         std::shared_ptr<faiss::gpu::StandardGpuResources> m_gpuResources;