added pucks and samples

backend/app/utils.py

@@ -0,0 +1,11 @@
+from app.models import Dewar
+
+
+def calculate_number_of_pucks(dewar: Dewar) -> int:
+    return len(dewar.pucks) if dewar.pucks else 0
+
+
+def calculate_number_of_samples(dewar: Dewar) -> int:
+    if not dewar.pucks:
+        return 0
+    return sum(len(puck.positions) for puck in dewar.pucks)