fix: 入库成品/半成品/采购编辑其它字段时不再误清空图片——仅显式携带图片字段才更新

inventory-backend/app/services/inbound/buy_service.py

@@ -279,6 +279,7 @@ class BuyInboundService:
             for k, v in field_mapping.items():
                 if k in data: setattr(stock, v, data[k])
 
+            # ★ 仅当 payload 明确携带 arrival_photo 时才更新（含 [] 表示清空）；改其它字段不动图片
             if 'arrival_photo' in data:
                 new_photo_list = data['arrival_photo']
                 stock.arrival_photo = json.dumps(new_photo_list)
@@ -293,11 +294,11 @@ class BuyInboundService:
                         stock.id,
                         new_photo_list
                     )
-            else:
-                stock.arrival_photo = None
-                ImageEmbeddingService.delete_embeddings(
-                    ImageEmbeddingService.MODULE_STOCK_BUY, stock.id
-                )
+                else:
+                    # 图片被清空([])时，同步清理该记录的图片向量
+                    ImageEmbeddingService.delete_embeddings(
+                        ImageEmbeddingService.MODULE_STOCK_BUY, stock.id
+                    )
 
             if 'inspection_report' in data: stock.inspection_report = json.dumps(data['inspection_report'])