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/ANSFR.cpp

@@ -757,6 +757,7 @@ namespace ANSCENTER {
             else {
                 _detector = std::make_unique<ANSOVFD>();
             }
+            _detector->SetMaxSlotsPerGpu(m_maxSlotsPerGpu);
 
             // LOCK DURING INITIALIZATION
             bool initSuccess;
@@ -796,6 +797,7 @@ namespace ANSCENTER {
         try {
             // Create recognizer instance
             _recognizer = std::make_unique<ANSFaceRecognizer>();
+            _recognizer->SetMaxSlotsPerGpu(m_maxSlotsPerGpu);
 
             // Configure model
             ModelConfig recognizerConfig;