feat(product-gift): handlePaymentSuccess 追加赠品发放逻辑

cfc-backend/src/main/java/com/etotem/cfc/service/ProductOrderService.java

@@ -778,6 +778,33 @@ public class ProductOrderService {
             log.error("商品赠送会员失败: orderNo={}", orderNo, e);
             // 不阻塞支付流程
         }
+        // 发放订单赠品（CF值 + 实物库存扣减）
+        try {
+            List<ProductOrderGift> pendingGifts = productOrderGiftMapper.selectList(
+                    new LambdaQueryWrapper<ProductOrderGift>()
+                            .eq(ProductOrderGift::getOrderId, order.getId())
+                            .eq(ProductOrderGift::getFulfilled, 0));
+            for (ProductOrderGift gift : pendingGifts) {
+                if ("cf".equals(gift.getGiftType()) && gift.getCfValue() != null && gift.getCfValue() > 0) {
+                    platformPointsService.earn(order.getBuyerId(), gift.getCfValue(),
+                            "product_gift", order.getId(),
+                            "购买商品赠品: " + (gift.getGiftProductName() != null ? gift.getGiftProductName() : "CF值"));
+                } else if ("product".equals(gift.getGiftType()) && gift.getGiftProductId() != null) {
+                    int qty = gift.getQuantity() != null ? gift.getQuantity() : 1;
+                    boolean stockOk = productService.decreaseStock(gift.getGiftProductId(), qty);
+                    if (!stockOk) {
+                        log.error("赠品库存扣减失败: orderNo={}, giftProductId={}", orderNo, gift.getGiftProductId());
+                    } else {
+                        inventoryService.recordOutbound(gift.getGiftProductId(), null, qty,
+                                "gift", order.getId(), null, "商品赠品:" + orderNo);
+                    }
+                }
+                gift.setFulfilled(1);
+                productOrderGiftMapper.updateById(gift);
+            }
+        } catch (Exception e) {
+            log.error("订单{}赠品发放异常: {}", orderNo, e.getMessage());
+        }
         // 触发通关解锁刷新：购物成功（PURCHASE 关卡）
         try {
             if (order.getFamilyId() != null) {