참여 채널(channel) 필드 추가

- Participant 엔티티에 channel 필드 추가 (기본값: SNS)
- ParticipationRequest/Response DTO에 channel 필드 추가
- ParticipantRegisteredEvent에 channel 필드 추가
- ParticipationService에서 channel 정보 전달
- 참여 경로 분석 및 마케팅 효과 측정 가능

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

participation-service/src/main/java/com/kt/event/participation/application/dto/ParticipationRequest.java

@@ -23,6 +23,9 @@ public class ParticipationRequest {
     @Email(message = "이메일 형식이 올바르지 않습니다")
     private String email;
 
+    @Builder.Default
+    private String channel = "SNS";
+
     @Builder.Default
     private Boolean agreeMarketing = false;
 

participation-service/src/main/java/com/kt/event/participation/application/dto/ParticipationResponse.java

@@ -19,6 +19,7 @@ public class ParticipationResponse {
     private String name;
     private String phoneNumber;
     private String email;
+    private String channel;
     private LocalDateTime participatedAt;
     private Boolean storeVisited;
     private Integer bonusEntries;
@@ -31,6 +32,7 @@ public class ParticipationResponse {
             .name(participant.getName())
             .phoneNumber(participant.getPhoneNumber())
             .email(participant.getEmail())
+            .channel(participant.getChannel())
             .participatedAt(participant.getCreatedAt())
             .storeVisited(participant.getStoreVisited())
             .bonusEntries(participant.getBonusEntries())

participation-service/src/main/java/com/kt/event/participation/application/service/ParticipationService.java

@@ -60,6 +60,7 @@ public class ParticipationService {
             .name(request.getName())
             .phoneNumber(request.getPhoneNumber())
             .email(request.getEmail())
+            .channel(request.getChannel())
             .storeVisited(request.getStoreVisited())
             .bonusEntries(Participant.calculateBonusEntries(request.getStoreVisited()))
             .agreeMarketing(request.getAgreeMarketing())

participation-service/src/main/java/com/kt/event/participation/domain/participant/Participant.java

@@ -63,6 +63,13 @@ public class Participant extends BaseTimeEntity {
     @Column(name = "email", length = 100)
     private String email;
 
+    /**
+     * 참여 채널
+     * 기본값: SNS
+     */
+    @Column(name = "channel", length = 20, nullable = false)
+    private String channel;
+
     /**
      * 매장 방문 여부
      * true일 경우 보너스 응모권 부여
@@ -165,5 +172,8 @@ public class Participant extends BaseTimeEntity {
         if (this.agreeMarketing == null) {
             this.agreeMarketing = false;
         }
+        if (this.channel == null || this.channel.isBlank()) {
+            this.channel = "SNS";
+        }
     }
 }

participation-service/src/main/java/com/kt/event/participation/infrastructure/kafka/event/ParticipantRegisteredEvent.java

@@ -21,6 +21,7 @@ public class ParticipantRegisteredEvent {
     private String eventId;
     private String name;
     private String phoneNumber;
+    private String channel;
     private Boolean storeVisited;
     private Integer bonusEntries;
     private LocalDateTime participatedAt;
@@ -31,6 +32,7 @@ public class ParticipantRegisteredEvent {
             .eventId(participant.getEventId())
             .name(participant.getName())
             .phoneNumber(participant.getPhoneNumber())
+            .channel(participant.getChannel())
             .storeVisited(participant.getStoreVisited())
             .bonusEntries(participant.getBonusEntries())
             .participatedAt(participant.getCreatedAt())