fix: set DNS cache TTL to prevent stale lookups

CacheableLookup defaults to maxTtl=Infinity, meaning successful DNS
lookups are cached forever until process restart. This causes monitors
to fail permanently if DNS changes or if a resolver outage causes
ENOTFOUND errors to persist after recovery.

Set maxTtl=300s (5 min) for successful lookups and errorTtl=30s for
failed lookups so the cache recovers automatically.

server/src/service/infrastructure/network/HttpProvider.ts

@@ -15,7 +15,7 @@ export class HttpProvider implements IStatusProvider<HttpStatusPayload> {
 		private got: Got,
 		private advancedMatcher: AdvancedMatcher
 	) {
-		const cacheable = new CacheableLookup();
+		const cacheable = new CacheableLookup({ maxTtl: 300, errorTtl: 30 });
 		this.got = got.extend({
 			dnsCache: cacheable,
 			timeout: {