feat: add validates timestamp

[LoneExile]

1. Fixed timestamp format conversion

Before:

const requestBody = {
  filter: {
    query,
    from: `${from * 1000}`,  // Wrong - sends string "1730097055000"
    to: `${to * 1000}`,
  },
}

After:

// Convert epoch seconds to ISO 8601 format
const fromISO = new Date(from * 1000).toISOString()
const toISO = new Date(to * 1000).toISOString()

const response = await apiInstance.listLogs({
  body: {
    filter: {
      query,
      from: fromISO,  // Now sends "2025-10-28T06:30:55.000Z"
      to: toISO,
    },
    page: { limit },
    sort: '-timestamp',
  },
})

2. Added timestamp validation

Added validateTimestamps() function that checks:

• Timestamps are valid finite numbers
• from is before to
• Timestamps are not in the future (with 5-minute buffer for clock skew)
• Warns if querying very old logs (>1 year)

Provides helpful error messages:

Invalid 'from' timestamp: 2025-10-28T14:14:10.000Z is in the future.
Current time: 2025-10-28T10:14:21.000Z. Please check your timestamp calculation.

Related Issues

Fixes #22