get:
  operationId: getServerTime
  summary: Get server time
  description: |
    Returns the current UTC server timestamp. Used by clients to synchronise
    local time and validate TOTP / OTP expiry windows.
  tags: [healthCheck]
  responses:
    "200":
      description: Server time returned directly.
      content:
        application/json:
          schema:
            $ref: "../../components.yaml#/components/schemas/ServerTimeResponse"
          example:
            timestamp: 1717142400
    "400":
      $ref: "../../components.yaml#/components/responses/Failure"