fix: 修复库存盘点已盘数量卡在500的问题

inventory-backend/app/api/v1/inbound/stock.py

@@ -325,11 +325,21 @@ def get_drafts():
     total = len(items)
     start = (page - 1) * limit
     end = start + limit
+
+    # 计算真实的去重"已盘数量"
+    counted_items_set = set()
+    for draft_item in items:
+        if draft_item.get('qty_actual') is not None:
+            unique_key = f"{draft_item.get('source_table', '')}_{draft_item.get('stock_id', '')}"
+            counted_items_set.add(unique_key)
+    total_scanned_unique = len(counted_items_set)
+
     paginated_items = items[start:end]
 
     return jsonify({
         'items': paginated_items,
         'total': total,
+        'total_scanned': total_scanned_unique,
         'page': page,
         'limit': limit
     }), 200