Make mock mode similarity and liveness scores dynamic for realistic demo visuals

backend/app/api/v1/kiosk.py

@@ -201,7 +201,8 @@ def scan_face(
     
     if face_engine.mock_mode:
         # Override match similarity in mock mode to allow functional kiosk scans during demos
-        similarity = 0.85
+        import random
+        similarity = random.uniform(0.81, 0.94)
     
     if similarity < face_threshold:
         # Low confidence match -> Unknown

backend/app/services/face_engine.py

@@ -385,7 +385,9 @@ class FaceEngine:
             # Default mock liveness: Check if the photo is in color and average variance is high
             # We return True for mock testing, with high liveness score (0.95)
             # If the image filename/source contains "spoof" we return False
-            return 0.92, True
+            import random
+            score = random.uniform(0.91, 0.98)
+            return score, True
 
         try:
             x1, y1, x2, y2 = bbox