修复一些错误

app/Services/BillDetailService.php

@@ -14,9 +14,9 @@ class BillDetailService
 {
     /**
      * 合并后的商品明细：按商品聚合账单关联的全部订单明细
-     * 单价为加权平均口径（Σ金额÷Σ数量），保证 单价×数量=金额
+     * 单价为加权平均口径（Σ金额÷Σ数量），保证 单价×数量=金额；附商品首图
      *
-     * @return array<int, array{product_id: int, product_name: string, product_spec: string, unit: string, price: string, quantity: int, weight: string, amount: string}>
+     * @return array<int, array{product_id: int, product_name: string, product_spec: string, unit: string, price: string, quantity: int, weight: string, amount: string, image: string}>
      */
     public function mergedItems(BillModel $bill): array
     {
@@ -33,7 +33,7 @@ class BillDetailService
      * 用于账单合并导出，单价同为加权平均口径
      *
      * @param array<int, int> $billIds 账单ID列表
-     * @return array<int, array{product_id: int, product_name: string, product_spec: string, unit: string, price: string, quantity: int, weight: string, amount: string}>
+     * @return array<int, array{product_id: int, product_name: string, product_spec: string, unit: string, price: string, quantity: int, weight: string, amount: string, image: string}>
      */
     public function mergedItemsOfBills(array $billIds): array
     {
@@ -47,10 +47,10 @@ class BillDetailService
 
     /**
      * 按商品聚合订单明细：数量累加、重量/金额 bc 累加、单价加权平均，
-     * 按「分类sort → 商品sort」排序
+     * 首图取明细快照 image_ids 批量解析，按「分类sort → 商品sort」排序
      *
      * @param Collection<int, StoreOrderItemModel> $items
-     * @return array<int, array{product_id: int, product_name: string, product_spec: string, unit: string, price: string, quantity: int, weight: string, amount: string}>
+     * @return array<int, array{product_id: int, product_name: string, product_spec: string, unit: string, price: string, quantity: int, weight: string, amount: string, image: string}>
      */
     private function aggregateItems(Collection $items): array
     {
@@ -85,6 +85,7 @@ class BillDetailService
                 'quantity' => $quantity,
                 'weight' => $weight,
                 'amount' => $amount,
+                'image_ids' => (array) $first->image_ids,
                 'category_sort' => (int) ($product->category->sort ?? 9999),
                 'product_sort' => (int) ($product->sort ?? 9999),
             ];
@@ -93,6 +94,9 @@ class BillDetailService
             [$a['category_sort'], $a['product_sort'], $a['product_id']]
             <=> [$b['category_sort'], $b['product_sort'], $b['product_id']]);
 
+        // 首图批量解析（写入 image、移除 image_ids）
+        app(ItemImageResolver::class)->resolve($rows);
+
         return array_map(static function (array $row): array {
             unset($row['category_sort'], $row['product_sort']);
             return $row;