Fixed mod of N-acetyl (N-term)

--- Resubmitted on 2026-03-30 15:32:27 UTC ---
Changes detected:
  Row count: 37969 → 59608
  Added columns: ['epsilon_precision_mean', 'epsilon_precision_median', 'log2_empirical_mean', 'log2_empirical_median']
  Removed columns: ['logIntensityMean']