feat(#30): 회원가입 API 구현

- 회원가입 기능을 구현했어요.
- 회원가입시 이메일 인증이 되어있지 않으면 예외를 발생시켜요.
- 회원가입시 이미 존재하는 유저면 예외를 발생시켜요.

src/main/java/com/bamdoliro/sinabro/application/user/SignUpUseCase.java

@@ -0,0 +1,48 @@
+package com.bamdoliro.sinabro.application.user;
+
+import com.bamdoliro.sinabro.domain.user.domain.SignUpVerification;
+import com.bamdoliro.sinabro.domain.user.domain.User;
+import com.bamdoliro.sinabro.domain.user.domain.type.Authority;
+import com.bamdoliro.sinabro.infrastructure.persistence.user.SignUpVerificationRepository;
+import com.bamdoliro.sinabro.infrastructure.persistence.user.UserRepository;
+import com.bamdoliro.sinabro.presentation.user.dto.request.SignUpRequest;
+import com.bamdoliro.sinabro.shared.annotation.UseCase;
+import lombok.RequiredArgsConstructor;
+import org.springframework.transaction.annotation.Transactional;
+
+@RequiredArgsConstructor
+@UseCase
+public class SignUpUseCase {
+
+    private final UserRepository userRepository;
+    private final SignUpVerificationRepository signUpVerificationRepository;
+
+    @Transactional
+    public void execute(SignUpRequest request) {
+        validate(request);
+
+        userRepository.save(
+                User.builder()
+                        .email(request.getEmail())
+                        .name(request.getName())
+                        .password(request.getPassword())
+                        .authority(Authority.USER)
+                        .build()
+        );
+    }
+
+    private void validate(SignUpRequest request) {
+        SignUpVerification signUpVerification = signUpVerificationRepository.findById(request.getEmail())
+                .orElseThrow(RuntimeException::new);
+
+        if (!signUpVerification.getIsVerified()) {
+            throw new RuntimeException();
+        }
+
+        if (userRepository.existsByEmail(request.getEmail())) {
+            throw new RuntimeException();
+        }
+
+        signUpVerificationRepository.delete(signUpVerification);
+    }
+}

src/main/java/com/bamdoliro/sinabro/infrastructure/persistence/user/UserRepository.java

@@ -8,4 +8,6 @@
 public interface UserRepository extends JpaRepository<User, Long> {
 
     Optional<User> findByEmail(String email);
+
+    boolean existsByEmail(String email);
 }

src/main/java/com/bamdoliro/sinabro/presentation/user/dto/request/SignUpRequest.java

@@ -0,0 +1,29 @@
+package com.bamdoliro.sinabro.presentation.user.dto.request;
+
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+public class SignUpRequest {
+
+    @NotBlank(message = "필수값입니다.")
+    @Email(message = "이메일 형식이어야 합니다")
+    private String email;
+
+    @NotBlank(message = "필수값입니다.")
+    @Size(max = 50, message = "50자 이하여야 합니다.")
+    private String name;
+
+    @NotBlank(message = "필수값입니다.")
+    @Size(max = 20, message = "비밀번호는 20글자 이하여야 합니다.")
+    @Pattern(regexp = "^(?=.*[A-Za-z])(?=.*\\d)(?=.*[$@$!%*#?&])[A-Za-z\\d$@$!%*#?&]{8,}$",
+            message = "비밀번호는 최소 하나의 문자, 숫자, 특수문자를 포함하며 8 글자 이상이어야 합니다.")
+    private String password;
+}