Removed redundant numbering in headers for clarity and improved the phrasing to better emphasize the necessity of DTO classes in both testing and data transmission contexts. This ensures better readability and consistency across the document.

Updated `MemberService` to return `MemberResponse` DTO instead of the `Member` entity, encapsulating domain data. Introduced the `MemberResponse` class to map entity fields, and adjusted the controller to reflect the DTO usage. This improves separation of concerns and avoids exposing domain entities directly.

…t-test

Moved @EnableJpaAuditing to a dedicated configuration class for clarity. Updated the `MemberResponse` class to use a `from` method with protected access for the constructor. Added unit tests for `MemberRestController` to validate member retrieval by code.

Reorganized the MockMvc usage bullet point to align it with unit testing instead of integration testing. This improves clarity and maintains consistency in the structure of the study plan.