Maintenance: Response & Error classes - Modernize with Java 21 and improve code consistency (#112)

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Claude <[email protected]>

Author: 3 people

src/main/java/spring/memewikibe/support/error/ErrorMessage.java

@@ -1,22 +1,15 @@
 package spring.memewikibe.support.error;
 
-import lombok.Getter;
-
-@Getter
-public final class ErrorMessage {
-    private final String code;
-    private final String message;
-    private final Object data;
-
+public record ErrorMessage(
+    String code,
+    String message,
+    Object data
+) {
     public ErrorMessage(ErrorType errorType) {
-        this.code = errorType.getCode().name();
-        this.message = errorType.getMessage();
-        this.data = null;
+        this(errorType.getCode().name(), errorType.getMessage(), null);
     }
 
     public ErrorMessage(ErrorType errorType, Object data) {
-        this.code = errorType.getCode().name();
-        this.message = errorType.getMessage();
-        this.data = data;
+        this(errorType.getCode().name(), errorType.getMessage(), data);
     }
 }

src/main/java/spring/memewikibe/support/response/ApiResponse.java

@@ -10,7 +10,7 @@ public final class ApiResponse<S> {
     private final S success;
     private final ErrorMessage error;
 
-    public ApiResponse(ResultType resultType, S success, ErrorMessage error) {
+    private ApiResponse(ResultType resultType, S success, ErrorMessage error) {
         this.resultType = resultType;
         this.success = success;
         this.error = error;

src/main/java/spring/memewikibe/support/response/PageResponse.java

@@ -1,7 +1,10 @@
 package spring.memewikibe.support.response;
 
+import lombok.Getter;
+
 import java.util.List;
 
+@Getter
 public class PageResponse<P extends Paging, T> {
     private final P paging;
     private final List<T> results;
@@ -14,12 +17,4 @@ private PageResponse(P paging, List<T> results) {
     public static <T> PageResponse<Cursor, T> cursor(Cursor paging, List<T> results) {
         return new PageResponse<>(paging, results.subList(0, Math.min(results.size(), paging.getPageSize())));
     }
-
-    public P getPaging() {
-        return paging;
-    }
-
-    public List<T> getResults() {
-        return results;
-    }
 }