v1.2.31: feat: Add correlation ID and enhance precision to request logs

Introduce `correlationId` to link `request_log` entries with `audit_log` events,
greatly improving incident investigation by connecting operational and audit data.

Further enhance request log data quality and usability:
- `createdAt` now records milliseconds (DATETIME(3)) and uses UTC for accurate
  ordering and consistency, especially across DST changes.
- `responseTime` precision is increased to 0.1ms (DECIMAL(12,4)) for better
  analysis of very fast requests.
- IP address column length is expanded to 45 characters to support IPv6 and
  prevent truncation of `X-Forwarded-For` headers.