feat: Couple DTO 추가

src/main/java/com/hanyang/lovepin/couple/presentation/dto/CoupleRequestDto.java

@@ -0,0 +1,10 @@
+package com.hanyang.lovepin.couple.presentation.dto;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+public class CoupleRequestDto {
+    private Long userId;
+}

src/main/java/com/hanyang/lovepin/couple/presentation/dto/CoupleRequestResponseDto.java

@@ -0,0 +1,24 @@
+package com.hanyang.lovepin.couple.presentation.dto;
+
+import com.hanyang.lovepin.couple.domain.CoupleRequest;
+import lombok.Getter;
+import java.time.LocalDateTime;
+
+@Getter
+public class CoupleRequestResponseDto {
+    private Long requestId;
+    private Long senderId;
+    private Long receiverId;
+    private String status;
+    private LocalDateTime createdAt;
+    private LocalDateTime expiresAt;
+
+    public CoupleRequestResponseDto(CoupleRequest request) {
+        this.requestId = request.getRequestId();
+        this.senderId = request.getSender().getUserId();
+        this.receiverId = request.getReceiver().getUserId();
+        this.status = request.getStatus().name();
+        this.createdAt = request.getCreatedAt();
+        this.expiresAt = request.getExpiresAt();
+    }
+}

src/main/java/com/hanyang/lovepin/couple/presentation/dto/CoupleResponseDto.java

@@ -0,0 +1,25 @@
+package com.hanyang.lovepin.couple.presentation.dto;
+
+import com.hanyang.lovepin.couple.domain.Couple;
+import lombok.Getter;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+
+@Getter
+public class CoupleResponseDto {
+    private Long coupleId;
+    private Long user1Id;
+    private Long user2Id;
+    private LocalDate dDayDate;
+    private String status;
+    private LocalDateTime createdAt;
+
+    public CoupleResponseDto(Couple couple) {
+        this.coupleId = couple.getCoupleId();
+        this.user1Id = couple.getUser1().getUserId();
+        this.user2Id = couple.getUser2().getUserId();
+        this.dDayDate = couple.getDDayDate();
+        this.status = couple.getStatus().name();
+        this.createdAt = couple.getCreatedAt();
+    }
+}