Bugfix: Only allow rank==0 to clean up old checkpoints (#2558)

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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한시    01
두시    02
세시    03
네시    04
다섯시    05
여섯시    06
일곱시    07
여덟시    08
아홉시    09
열시    10
열한시    11
열두시    12