feat: ProductMetrics에 상품 정보 필드 추가 및 업데이트 메서드 구현

- `productName`, `price`, `isSoldOut` 필드 추가로 상품 데이터 확장
- `updateProductSnapshot` 메서드 구현으로 상품 상태 동기화 지원
- 패키지 구조 개선: `ProductMetrics`를 `metrics`에서 최상위 `domain`으로 이동
- `ProductMetricsService`에서 상품 정보 업데이트 로직 통합 및 Redis 캐시 처리 강화

Author: yeonjiyeon

apps/commerce-streamer/src/main/java/com/loopers/domain/metrics/ProductMetricsService.java

@@ -1,6 +1,7 @@
 package com.loopers.domain.metrics;
 
 import com.loopers.core.cache.RedisCacheHandler;
+import com.loopers.domain.ProductMetrics;
 import com.loopers.domain.event.EventHandled;
 import com.loopers.event.LikeCountEvent;
 import com.loopers.event.ProductStockEvent;
@@ -50,6 +51,12 @@ public void processSalesCountEvent(ProductStockEvent event) {
 
     metrics.addSalesCount(event.sellQuantity());
 
+    metrics.updateProductSnapshot(
+        event.productName(),
+        event.price(),
+        event.currentStock()
+    );
+
     if (event.currentStock() <= 0) {
       redisCacheHandler.delete("product:detail:" + event.productId());
       redisCacheHandler.deleteByPattern("product:list");

apps/commerce-streamer/src/main/java/com/loopers/infrastructure/ProductMetricsRepository.java

@@ -1,6 +1,6 @@
 package com.loopers.infrastructure;
 
-import com.loopers.domain.metrics.ProductMetrics;
+import com.loopers.domain.ProductMetrics;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 

…opers/domain/metrics/ProductMetrics.java …a/com/loopers/domain/ProductMetrics.javaapps/commerce-streamer/src/main/java/com/loopers/domain/metrics/ProductMetrics.java renamed to modules/jpa/src/main/java/com/loopers/domain/ProductMetrics.java apps/commerce-streamer/src/main/java/com/loopers/domain/metrics/ProductMetrics.java renamed to modules/jpa/src/main/java/com/loopers/domain/ProductMetrics.java

@@ -1,4 +1,4 @@
-package com.loopers.domain.metrics;
+package com.loopers.domain;
 
 import jakarta.persistence.Entity;
 import jakarta.persistence.Id;
@@ -21,6 +21,9 @@ public class ProductMetrics {
   private int viewCount = 0;
   private int salesCount = 0;
 
+  private String productName;
+  private Long price;
+  private boolean isSoldOut;
   private LocalDateTime updatedAt;
 
   public ProductMetrics(Long productId) {
@@ -44,4 +47,11 @@ public void addSalesCount(int quantity) {
     this.salesCount += quantity;
     this.updatedAt = LocalDateTime.now();
   }
+
+  public void updateProductSnapshot(String productName, long price, int currentStock) {
+    this.productName = productName;
+    this.price = price;
+    this.isSoldOut = (currentStock <= 0);
+    this.updatedAt = LocalDateTime.now();
+  }
 }