Add POI feature and imporve the overall backend implementation

services/inventory/app/repositories/ingredient_repository.py

@@ -332,7 +332,10 @@ class IngredientRepository(BaseRepository[Ingredient, IngredientCreate, Ingredie
                     'ingredient': ingredient,
                     'current_stock': float(current_stock) if current_stock else 0.0,
                     'threshold': ingredient.low_stock_threshold,
-                    'needs_reorder': current_stock <= ingredient.reorder_point if current_stock else True
+                    'needs_reorder': (
+                        current_stock <= ingredient.reorder_point
+                        if current_stock and ingredient.reorder_point is not None else True
+                    )
                 })
             
             return results