[feature] 회원가입 시 응답 바디가 없도록 수정

설명:
- 회원가입 시 로그인과 동일한 응답을 처리하는 점을 보고 고민 끝에 회원가입 시 바디는 없게 하고 로그인 시에 JWT 토큰을 받도록 수정하려 합니다.

src/main/java/com/coolpeace/domain/member/controller/MemberController.java

@@ -6,7 +6,6 @@
 import com.coolpeace.domain.member.dto.request.RefreshAccessTokenRequest;
 import com.coolpeace.domain.member.dto.response.MemberLoginResponse;
 import com.coolpeace.domain.member.dto.response.MemberRefreshAccessTokenResponse;
-import com.coolpeace.domain.member.dto.response.MemberRegisterResponse;
 import com.coolpeace.domain.member.service.MemberService;
 import com.coolpeace.global.jwt.security.JwtPrincipal;
 import com.coolpeace.global.resolver.AuthJwtCredential;
@@ -32,11 +31,11 @@ public ResponseEntity<MemberLoginResponse> login(
     }
 
     @PostMapping("/register")
-    public ResponseEntity<MemberRegisterResponse> register(
+    public ResponseEntity<Void> register(
             @Valid @RequestBody MemberRegisterRequest registerRequest
     ) {
-        return ResponseEntity.created(URI.create("/"))
-                .body(MemberRegisterResponse.from(memberService.registerAsOwner(registerRequest)));
+        memberService.registerAsOwner(registerRequest);
+        return ResponseEntity.created(URI.create("/")).build();
     }
 
     @GetMapping("/register/check/email")

src/main/java/com/coolpeace/domain/member/service/MemberService.java

@@ -50,19 +50,16 @@ public MemberLoginResponse login(MemberLoginRequest loginRequest) {
     }
 
     @Transactional
-    public JwtPair registerAsOwner(MemberRegisterRequest registerRequest) {
+    public void registerAsOwner(MemberRegisterRequest registerRequest) {
         validateMemberEmail(registerRequest.email());
         Role role = roleRepository.findByRoleType(RoleType.OWNER).orElseThrow(MemberRoleNotFoundException::new);
-        Member newMember = memberRepository.save(
+        memberRepository.save(
                 Member.from(
                         registerRequest.email(),
                         passwordEncoder.encode(registerRequest.password()),
                         registerRequest.name(),
                         role)
         );
-
-        return jwtService.createTokenPair(
-                JwtPayload.fromNow(String.valueOf(newMember.getId()), newMember.getEmail()));
     }
 
     @Transactional(readOnly = true)