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

Gang Zhuo

2025-09-20 6244b743a70f8ac152e6b8f517669671322da0a8

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百一    101
百二    102
百三    103
百四    104
百五    105
百六    106
百七    107
百八    108
百九    109