feat: MemberDetailResponse 추가

#819

backend/emm-sale/src/main/java/com/emmsale/member/application/MemberQueryService.java

@@ -6,6 +6,7 @@
 import com.emmsale.login.application.dto.MemberQueryResponse;
 import com.emmsale.member.application.dto.MemberProfileResponse;
 import com.emmsale.member.domain.Member;
+import com.emmsale.member.domain.MemberActivityRepository;
 import com.emmsale.member.domain.MemberRepository;
 import com.emmsale.member.exception.MemberException;
 import lombok.RequiredArgsConstructor;
@@ -18,6 +19,7 @@
 public class MemberQueryService {
 
   private final MemberRepository memberRepository;
+  private final MemberActivityRepository memberActivityRepository;
 
   public Member findById(final Long memberId) {
     return memberRepository.findById(memberId)
@@ -34,9 +36,8 @@ public MemberQueryResponse findOrCreateMember(
     return new MemberQueryResponse(member.getId(), member.isOnboarded());
   }
 
-  public MemberProfileResponse findProfile(Long memberId) {
-    final Member member = memberRepository.findById(memberId)
-        .orElseThrow(() -> new MemberException(NOT_FOUND_MEMBER));
+  public MemberProfileResponse findProfile(final Long memberId) {
+    final Member member = memberRepository.getByIdOrElseThrow(memberId);
 
     return MemberProfileResponse.from(member);
   }

backend/emm-sale/src/main/java/com/emmsale/member/application/dto/MemberDetailResponse.java

@@ -0,0 +1,41 @@
+package com.emmsale.member.application.dto;
+
+import static java.util.stream.Collectors.toUnmodifiableList;
+
+import com.emmsale.member.domain.Member;
+import com.emmsale.member.domain.MemberActivity;
+import java.util.List;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Getter
+public class MemberDetailResponse {
+
+  private static final String GITHUB_URL_PREFIX = "https://github.com/";
+
+  private final Long id;
+  private final String name;
+  private final String description;
+  private final String imageUrl;
+  private final String githubUrl;
+  private final List<MemberActivityResponse> activities;
+
+  public static MemberDetailResponse from(
+      final Member member,
+      final List<MemberActivity> activities
+  ) {
+    final List<MemberActivityResponse> memberActivityResponses = activities.stream()
+        .map(MemberActivityResponse::from)
+        .collect(toUnmodifiableList());
+
+    return new MemberDetailResponse(
+        member.getId(),
+        member.getName(),
+        member.getDescription(),
+        member.getImageUrl(),
+        GITHUB_URL_PREFIX + member.getGithubUsername(),
+        memberActivityResponses
+    );
+  }
+}