chore: Kafka 프로듀서 멱등성 설정 및 설정 정리

- Kafka 설정에 enable.idempotence=true 및 acks=all 프로듀서 옵션 추가
- OutboxService에서 사용하지 않는 import 제거

Author: yeonjiyeon

apps/commerce-api/src/main/java/com/loopers/domain/event/OutboxService.java

@@ -1,6 +1,5 @@
 package com.loopers.domain.event;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.loopers.infrastructure.event.OutboxRepository;
 import lombok.RequiredArgsConstructor;

modules/kafka/src/main/resources/kafka.yml

@@ -15,6 +15,9 @@ spring:
       key-serializer: org.apache.kafka.common.serialization.StringSerializer
       value-serializer: org.springframework.kafka.support.serializer.JsonSerializer
       retries: 3
+      acks: all
+      properties:
+        enable.idempotence: true
     consumer:
       group-id: loopers-default-consumer
       key-deserializer: org.apache.kafka.common.serialization.StringDeserializer