chore: release client-v1.0.71

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YZ4DskSRKsSiheQonFtQvx

client/lib/repositories/stock_in_repository.dart

@@ -130,4 +130,16 @@ class StockInRepository {
       );
     }
   }
+
+  /// 退单：退掉指定明细（item ids）。入库退单对应库存从库存删除。
+  Future<void> returnItems(int id, List<int> itemIds) async {
+    try {
+      await _client.post('/stock-in/orders/$id/return', data: {'item_ids': itemIds});
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '退单失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
 }

client/lib/repositories/stock_out_repository.dart

@@ -130,4 +130,16 @@ class StockOutRepository {
       );
     }
   }
+
+  /// 退单：退掉指定明细（item ids）。出库退单数量加回库存。
+  Future<void> returnItems(int id, List<int> itemIds) async {
+    try {
+      await _client.post('/stock-out/orders/$id/return', data: {'item_ids': itemIds});
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '退单失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
 }