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

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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일월    01
이월    02
삼월    03
사월    04
오월    05
육월    06
유월    06
칠월    07
팔월    08
구월    09
십월    10
시월    10
십일월    11
십이월    12