refactor(be): 제품의 가격, 수량을 확인하는데 적절한 데이터 타입으로 교체 (#296)

Author: flffkd12

backend/src/main/java/com/deliveranything/domain/order/dto/OrderItemRequest.java

@@ -5,8 +5,8 @@
 
 public record OrderItemRequest(
     @NotNull @Positive Long productId,
-    @NotNull @Positive Long price,
-    @NotNull @Positive Long quantity
+    @NotNull @Positive Integer price,
+    @NotNull @Positive Integer quantity
 ) {
 
 }

backend/src/main/java/com/deliveranything/domain/order/entity/OrderItem.java

@@ -33,13 +33,13 @@ public class OrderItem {
   private Product product;
 
   @Column(nullable = false)
-  private Long price;
+  private Integer price;
 
   @Column(nullable = false)
-  private Long quantity;
+  private Integer quantity;
 
   @Builder
-  public OrderItem(Product product, Long price, Long quantity) {
+  public OrderItem(Product product, Integer price, Integer quantity) {
     this.product = product;
     this.price = price;
     this.quantity = quantity;

backend/src/main/java/com/deliveranything/domain/order/event/dto/OrderItemInfo.java

@@ -5,8 +5,8 @@
 public record OrderItemInfo(
     Long productId,
     String productName,
-    Long quantity,
-    Long price
+    Integer quantity,
+    Integer price
 ) {
 
   public static OrderItemInfo fromOrderItem(OrderItem orderItem) {