refactor: switch FetchType to LAZY for debugging LazyInitializationException

Author: Ji-soo708

src/main/kotlin/com/dobby/backend/infrastructure/database/entity/member/ParticipantEntity.kt

@@ -15,7 +15,7 @@ class ParticipantEntity (
     @Column(name= "participant_id", columnDefinition = "CHAR(13)")
     val id: String,
 
-    @OneToOne(fetch = FetchType.EAGER, cascade = [CascadeType.ALL], orphanRemoval = true)
+    @OneToOne(fetch = FetchType.LAZY, cascade = [CascadeType.ALL], orphanRemoval = true)
     @JoinColumn(name = "member_id", nullable = false)
     val member: MemberEntity,
 

src/main/kotlin/com/dobby/backend/infrastructure/database/entity/member/ResearcherEntity.kt

@@ -10,7 +10,7 @@ class ResearcherEntity (
     @Column(name= "researcher_id", columnDefinition = "CHAR(13)")
     val id: String,
 
-    @OneToOne(fetch = FetchType.EAGER, cascade = [CascadeType.ALL], orphanRemoval = true)
+    @OneToOne(fetch = FetchType.LAZY, cascade = [CascadeType.ALL], orphanRemoval = true)
     @JoinColumn(name = "member_id", nullable = false)
     val member: MemberEntity,