Add division operation.

这个 Issue 没有描述。

Look at the existing calculator operations in the codebase to understand the structure. Identify where arithmetic operations are implemented, likely in a class handling calculations. Add a division method, handle edge cases like division by zero, and update the user interface or CLI to include the new operation. Test by running the program and verifying division works correctly.

由索引模型根据 Issue 内容生成。