fix: JWT 검증 시 clock skew 허용 범위 5초 추가#24
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변경 사항
TicketTokenManager.parseAndValidate()의 JWT 파서에setAllowedClockSkewSeconds(5)추가배경
Sentry 이슈 PRACTICKET-34:
POST /api/ticket엔드포인트에서ExpiredJwtException이 393회 발생하여 186명의 사용자에게 영향. JWT 만료 시각과 서버 현재 시각의 차이가 142ms에 불과하지만 허용 clock skew가 0ms로 설정되어 있어 서버 간 미세한 시각 차이만으로도 유효한 토큰이 거부됨.