[refactor] scene content DB에 TEXT 타입으로 저장

Author: hhongyeahh

src/main/java/everTale/everTale_be/domain/story/entity/Scene.java

@@ -16,6 +16,7 @@ public class Scene {
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
+    @Column(columnDefinition = "TEXT")
     private String content;
 
     private int page;