fix: crash when using online mode with uninitialized jieba (#2663)

Problem:
- Crash occurs with [punc_ct-transformer_cn-en-common-vocab471067-large-onnx](https://www.modelscope.cn/models/iic/punc_ct-transformer_cn-en-common-vocab471067-large-onnx) model
- Root cause: jieba is enabled but not properly initialized

Solution:
- Add jieba initialization before usage