chore: add JPA Auditing and BaseEntity configuration

src/main/kotlin/im/grit/infrastructure/common/entity/BaseDateTimeEntity.kt

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+package im.grit.infrastructure.common.entity
+
+import jakarta.persistence.Column
+import jakarta.persistence.EntityListeners
+import jakarta.persistence.GeneratedValue
+import jakarta.persistence.GenerationType
+import jakarta.persistence.Id
+import jakarta.persistence.MappedSuperclass
+import org.springframework.data.annotation.CreatedDate
+import org.springframework.data.annotation.LastModifiedDate
+import org.springframework.data.jpa.domain.support.AuditingEntityListener
+import java.time.LocalDateTime
+
+@MappedSuperclass
+@EntityListeners(AuditingEntityListener::class)
+abstract class BaseDateTimeEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    val id: Long = 0L
+
+    @CreatedDate
+    @Column(nullable = false, updatable = false, comment = "생성 날짜")
+    var createdAt: LocalDateTime = LocalDateTime.now()
+        protected set
+
+    @LastModifiedDate
+    @Column(nullable = false, comment = "최종 수정 날짜")
+    var updatedAt: LocalDateTime = LocalDateTime.now()
+        protected set
+}

src/main/kotlin/im/grit/infrastructure/common/entity/BaseEntity.kt

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+package im.grit.infrastructure.common.entity
+
+import jakarta.persistence.Column
+import jakarta.persistence.MappedSuperclass
+import org.springframework.data.annotation.CreatedBy
+import org.springframework.data.annotation.LastModifiedBy
+
+@MappedSuperclass
+abstract class BaseEntity : BaseDateTimeEntity() {
+
+    @CreatedBy
+    @Column(nullable = false, updatable = false, comment = "생성한 사용자")
+    var createdBy: String = ""
+        protected set
+
+    @LastModifiedBy
+    @Column(nullable = false, comment = "최종 수정한 사용자")
+    var updatedBy: String = ""
+        protected set
+}

src/main/kotlin/im/grit/infrastructure/config/audit/AuditConfig.kt

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+package im.grit.infrastructure.config.audit
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.data.domain.AuditorAware
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing
+
+@Configuration
+@EnableJpaAuditing
+class AuditConfig {
+
+    @Bean
+    fun auditorAwareProvider(): AuditorAware<String> {
+        return AuditorAwareImpl()
+    }
+}

src/main/kotlin/im/grit/infrastructure/config/audit/AuditorAwareImpl.kt

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+package im.grit.infrastructure.config.audit
+
+import org.springframework.data.domain.AuditorAware
+import org.springframework.security.authentication.AnonymousAuthenticationToken
+import org.springframework.security.core.context.SecurityContextHolder
+import java.util.*
+
+class AuditorAwareImpl : AuditorAware<String> {
+
+    override fun getCurrentAuditor(): Optional<String> {
+        val auditor = SecurityContextHolder.getContext().authentication
+            ?.takeIf { it.isAuthenticated && it !is AnonymousAuthenticationToken }
+            ?.name
+            ?: ANONYMOUS
+
+        return Optional.of(auditor)
+    }
+
+    companion object {
+        private const val ANONYMOUS = "anonymous"
+    }
+}