refactor(ThirdParty): 更新商品价格计算逻辑以支持SKU规格

- 将价格处理逻辑从priceRanges改为skuInfos数据结构
- 实现SKU规格价格提取，优先使用consignPrice，备选pifaPrice
- 添加SKU价格过滤机制，只处理大于0的价格
- 重新实现最小最大价格计算逻辑
- 更新注释说明为"取SKU规格价格"

app/services/ThirdParty/AlibabaAgent/ProductService.php

@@ -246,15 +246,23 @@ class ProductService extends AlibabaAgentBaseService
             }
         }
 
-        // --- 价格处理 ---
+        // --- 价格处理（取SKU规格价格） ---
         $saleInfo = $productInfo['saleInfo'] ?? [];
-        $priceRanges = $saleInfo['priceRanges'] ?? [];
+        $skuInfos = $productInfo['skuInfos'] ?? [];
         $minPrice = 0;
         $maxPrice = 0;
-        if (!empty($priceRanges)) {
-            $prices = array_column($priceRanges, 'price');
-            $minPrice = !empty($prices) ? (float)min($prices) : 0;
-            $maxPrice = !empty($prices) ? (float)max($prices) : 0;
+        if (!empty($skuInfos)) {
+            $skuPrices = [];
+            foreach ($skuInfos as $sku) {
+                $skuPrice = (float)($sku['consignPrice'] ?? $sku['pifaPrice'] ?? 0);
+                if ($skuPrice > 0) {
+                    $skuPrices[] = $skuPrice;
+                }
+            }
+            if (!empty($skuPrices)) {
+                $minPrice = (float)min($skuPrices);
+                $maxPrice = (float)max($skuPrices);
+            }
         }
 
         // --- 商品属性（如品牌、货号、规格等） ---