chore: update peer discovery and token registry config

- Remove outdated token registry comment from preprod config
- Change peer discovery initial delay from 1 to 5 minutes
- Refactor TimeUnit import to use static import for MINUTES

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Mateusz Czeladka

.env.docker-compose-preprod

@@ -112,7 +112,6 @@ POSTGRESQL_EXPORTER_PORT=9187
 PEER_DISCOVERY=true
 
 ## Token Registry
-# Externally hosted token registry is currently only available for mainnet
 TOKEN_REGISTRY_ENABLED=false
 TOKEN_REGISTRY_BASE_URL=
 TOKEN_REGISTRY_CACHE_TTL_HOURS=1

yaci-indexer/src/main/java/org/cardanofoundation/rosetta/yaciindexer/job/PeerDiscoveryJob.java

@@ -9,7 +9,8 @@
 import org.springframework.stereotype.Service;
 
 import java.util.Optional;
-import java.util.concurrent.TimeUnit;
+
+import static java.util.concurrent.TimeUnit.MINUTES;
 
 @Service
 @Slf4j
@@ -26,7 +27,7 @@ public void init() {
     }
 
     // Initial refresh after 1 minute, then every hour
-    @Scheduled(initialDelay = 1, fixedDelay = 60, timeUnit = TimeUnit.MINUTES)
+    @Scheduled(initialDelay = 5, fixedDelay = 60, timeUnit = MINUTES)
     public void refreshPeers() {
         log.info("Starting a periodic / scheduled peer discovery refresh...");