refactor: portfolio 도메인 마이그레이션

src/main/kotlin/land/leets/domain/portfolio/domain/Portfolio.kt

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+package land.leets.domain.portfolio.domain
+
+import com.fasterxml.jackson.annotation.JsonIgnore
+import jakarta.persistence.*
+import land.leets.domain.contributor.domain.Contributor
+import land.leets.domain.portfolio.type.ProjectScope
+import land.leets.domain.portfolio.type.ProjectType
+import land.leets.domain.shared.BaseTimeEntity
+import java.time.LocalDate
+
+@Entity(name = "portfolios")
+class Portfolio(
+    @Column(nullable = false)
+    val generation: Long,
+
+    @Column(nullable = false)
+    val name: String,
+
+    @Column(nullable = false)
+    val summary: String,
+
+    @Column(columnDefinition = "text", nullable = false)
+    val description: String,
+
+    @Column(nullable = false)
+    val type: ProjectType,
+
+    @Column(nullable = false)
+    val scope: ProjectScope,
+
+    @Column(nullable = false)
+    val startDate: LocalDate,
+
+    @Column(nullable = false)
+    val endDate: LocalDate,
+
+    @Column(nullable = false)
+    val serviceUrl: String,
+
+    @Column(nullable = false)
+    val logoImgName: String,
+
+    @Column(nullable = false)
+    val mainImgName: String,
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    val portfolioId: Long = 0L,
+
+    @OneToMany(mappedBy = "portfolio", fetch = FetchType.EAGER, orphanRemoval = true)
+    @JsonIgnore
+    val contributors: MutableList<Contributor> = mutableListOf()
+) : BaseTimeEntity()

src/main/kotlin/land/leets/domain/portfolio/domain/repository/PortfolioRepository.kt

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+package land.leets.domain.portfolio.domain.repository
+
+import land.leets.domain.portfolio.domain.Portfolio
+import land.leets.domain.portfolio.type.ProjectScope
+import org.springframework.data.jpa.repository.JpaRepository
+
+interface PortfolioRepository : JpaRepository<Portfolio, Long> {
+    fun findAllByGenerationAndScope(generation: Long, scope: ProjectScope): List<Portfolio>
+
+    fun findAllByScopeOrderByGenerationDesc(scope: ProjectScope): List<Portfolio>
+}

src/main/kotlin/land/leets/domain/portfolio/exception/PortfolioNotFoundException.kt

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+package land.leets.domain.portfolio.exception
+
+import land.leets.global.error.ErrorCode
+import land.leets.global.error.exception.ServiceException
+
+class PortfolioNotFoundException : ServiceException(ErrorCode.PORTFOLIO_NOT_FOUND)