fix(api): expose real 500 error stack trace and fix missing func import

inventory-backend/app/api/v1/inbound/product.py

@@ -185,9 +185,12 @@ def delete(id):
     try:
         material_name = ProductInboundService.delete_inbound(id)
         return jsonify({"code": 200, "msg": "删除成功", "material_name": material_name})
+    except ValueError as ve:
+        return jsonify({"code": 400, "msg": str(ve)})
     except Exception as e:
+        import traceback
         traceback.print_exc()
-        return jsonify({"code": 500, "msg": str(e)}), 500
+        return jsonify({"code": 500, "msg": f"服务器内部错误详情: {str(e)}"}), 500
 
 @inbound_product_bp.route('/<int:id>/history', methods=['GET'])
 @permission_required('inbound_product')