[BUG] ftpreader未能将额外的csvReaderConfig生效

经过实际的使用和测试，在 ftpreader未能将csvReaderConfig生效。

经过查看源代码 ftpreader中validateParameter的方法缺少
UnstructuredStorageReaderUtil.validateCsvReaderConfig(this.originConfig);

经过自行编译和测试，加此代码才能生效。

Start at ftpreader's validateParameter method and inspect how originConfig is validated. Verify the csvReaderConfig validation path against the reported behavior, then confirm that ftpreader accepts and applies the extra configuration after the change.

Written by the indexing model from the issue text.