[fix] 주문 생성 관련 에러 해결

src/main/java/com/back/domain/cart/repository/CartRepository.java

@@ -64,4 +64,11 @@ public interface CartRepository extends JpaRepository<Cart, Long> {
     @Modifying
     @Query("DELETE FROM Cart c WHERE c.user = :user AND c.product.productUuid IN :productUuids")
     void deleteByUserAndProductUuidIn(@Param("user") User user, @Param("productUuids") List<java.util.UUID> productUuids);
+
+    /**
+     * 주문 완료 후 펀딩 장바구니에서 제거 (Funding ID 기반)
+     */
+    @Modifying
+    @Query("DELETE FROM Cart c WHERE c.user = :user AND c.funding.id IN :fundingIds")
+    void deleteByUserAndFundingIdIn(@Param("user") User user, @Param("fundingIds") List<Long> fundingIds);
 }

src/main/java/com/back/domain/cart/service/CartService.java

@@ -292,7 +292,7 @@ public List<CartResponseDto> getAllCartItems(User user, boolean validateForOrder
     public void validateCartItemsForOrder(User user, boolean isFullOrder) {
         List<Cart> cartItems = isFullOrder ? 
             cartRepository.findByUserWithProduct(user) :
-            cartRepository.findByUserAndIsSelectedTrue(user);
+            cartRepository.findByUserAndIsSelectedTrueWithProduct(user);
 
         if (cartItems.isEmpty()) {
             throw new ServiceException("CART_EMPTY", "주문할 장바구니 아이템이 없습니다.");

src/main/java/com/back/domain/funding/entity/Funding.java

@@ -264,6 +264,19 @@ public void decreaseStock(int quantity) {
         this.soldCount += quantity;
     }
 
+    public void increaseStock(int quantity) {
+        if (quantity <= 0) {
+            throw new IllegalArgumentException("복원 수량은 0보다 커야 합니다.");
+        }
+        if (stock != null) {
+            this.stock += quantity;
+        }
+        this.soldCount -= quantity;
+        if (this.soldCount < 0) {
+            this.soldCount = 0;
+        }
+    }
+
     public boolean hasStock(int quantity) {
         return stock == null || stock >= quantity;
     }

src/main/java/com/back/domain/order/order/dto/request/OrderRequestDto.java

@@ -38,15 +38,23 @@ public record OrderRequestDto(
 ) {
 
     /**
-     * 주문 상품 요청 DTO
+     * 주문 상품 요청 DTO (NORMAL/FUNDING 통합)
      */
     public record OrderItemRequestDto(
-            @NotNull(message = "상품 UUID는 필수입니다.")
+            // NORMAL 상품용 (FUNDING일 때는 null 가능)
             UUID productUuid,
-
+
+            // FUNDING 상품용 (NORMAL일 때는 null 가능)
+            Long fundingId,
+            Integer fundingPrice,
+            Integer fundingStock,
+
             @NotNull(message = "수량은 필수입니다.")
             Integer quantity,
-
-            String optionInfo
+
+            String optionInfo,
+
+            // 장바구니 타입: NORMAL 또는 FUNDING
+            String cartType
     ) {}
 }