Function onResponse

onResponse(request: FastifyRequest, reply: FastifyReply): Promise<void>
Fastify onResponse hook that logs completed request details:
```
{ip} -- {method} {url} HTTP/{httpVersion} {status} {size} {elapsed}ms "{referrer}" "{userAgent}"
```
Intended to be registered via:
```
fastify.addHook("onResponse", onResponse)
```
Uses reply.log.info for 2xx/3xx and reply.log.error for 4xx/5xx, so each log record is automatically correlated with the request ID assigned by Fastify.

Client-controlled fields (URL, Referer, User-Agent) are sanitized via sanitize so embedded control characters cannot forge log entries.
Parameters
- request: FastifyRequest
  The completed Fastify request.
- reply: FastifyReply
  The Fastify reply containing status, headers, and elapsed time.
Returns Promise<void>
- Defined in hooks/onResponse.ts:36