[Fix] 외래 키 제약 조건으로 인한 목표 삭제 실패 오류 수정

src/main/java/com/umc/timeto/folder/entity/Folder.java

@@ -1,9 +1,13 @@
 package com.umc.timeto.folder.entity;
 
 import com.umc.timeto.goal.entity.Goal;
+import com.umc.timeto.todo.domain.Todo;
 import jakarta.persistence.*;
 import lombok.*;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Entity
 @Getter
 @Builder
@@ -25,6 +29,10 @@ public class Folder {
     @JoinColumn(name = "goal_id", nullable = false)
     private Goal goal;
 
+    @Builder.Default
+    @OneToMany(mappedBy = "folder", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<Todo> todos = new ArrayList<>();
+
     public Folder(String name, Goal goal) {
         this.name = name;
         this.goal = goal;

src/main/java/com/umc/timeto/goal/entity/Goal.java

@@ -1,9 +1,13 @@
 package com.umc.timeto.goal.entity;
 
+import com.umc.timeto.folder.entity.Folder;
 import com.umc.timeto.member.entity.Member;
 import jakarta.persistence.*;
 import lombok.*;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Entity
 @Getter
 @Setter
@@ -24,6 +28,10 @@ public class Goal {
     @JoinColumn(name="member_id")
     private Member member;
 
+    @Builder.Default
+    @OneToMany(mappedBy = "goal", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<Folder> folders = new ArrayList<>();
+
     public void update(String name, String color) {
         this.name = name;
         this.color = color;

src/main/java/com/umc/timeto/todo/domain/Todo.java

@@ -62,7 +62,6 @@ public void changeSortOrder(Integer sortOrder) {
     @JoinColumn(name = "folder_id", nullable = false)
     private Folder folder;
 
-
     //todo 삭제 시 연결된 block 자동 삭제
     @OneToOne(
             mappedBy = "todo",