EventService에 Kafka Producer 연동 추가 및 이벤트 배포 시 메시지 발행 구현

- EventService에 EventKafkaProducer 의존성 주입
- publishEvent 메서드에서 event-created 토픽으로 메시지 발행
- Event 엔티티의 selectedImageId 검증 임시 비활성화
- Kafka 메시지 발행 테스트 결과 문서 추가

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

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

event-service/src/main/java/com/kt/event/eventservice/application/service/EventService.java

@@ -13,6 +13,7 @@ import com.kt.event.eventservice.infrastructure.client.ContentServiceClient;
 import com.kt.event.eventservice.infrastructure.client.dto.ContentImageGenerationRequest;
 import com.kt.event.eventservice.infrastructure.client.dto.ContentJobResponse;
 import com.kt.event.eventservice.infrastructure.kafka.AIJobKafkaProducer;
+import com.kt.event.eventservice.infrastructure.kafka.EventKafkaProducer;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.hibernate.Hibernate;
@@ -43,6 +44,7 @@ public class EventService {
     private final JobRepository jobRepository;
     private final ContentServiceClient contentServiceClient;
     private final AIJobKafkaProducer aiJobKafkaProducer;
+    private final EventKafkaProducer eventKafkaProducer;
 
     /**
      * 이벤트 생성 (Step 1: 목적 선택)
@@ -171,6 +173,14 @@ public class EventService {
 
         eventRepository.save(event);
 
+        // Kafka 이벤트 발행
+        eventKafkaProducer.publishEventCreated(
+            event.getEventId(),
+            event.getUserId(),
+            event.getEventName(),
+            event.getObjective()
+        );
+
         log.info("이벤트 배포 완료 - eventId: {}", eventId);
     }
 

event-service/src/main/java/com/kt/event/eventservice/domain/entity/Event.java

@@ -219,9 +219,10 @@ public class Event extends BaseTimeEntity {
         if (startDate.isAfter(endDate)) {
             throw new IllegalStateException("시작일은 종료일보다 이전이어야 합니다.");
         }
-        if (selectedImageId == null) {
-            throw new IllegalStateException("이미지를 선택해야 합니다.");
-        }
+        // TODO: Frontend에서 selectedImageId 추적 구현 후 주석 제거
+        // if (selectedImageId == null) {
+        //     throw new IllegalStateException("이미지를 선택해야 합니다.");
+        // }
         if (channels.isEmpty()) {
             throw new IllegalStateException("배포 채널을 선택해야 합니다.");
         }