chore: disable peer discovery by default

Set PEER_DISCOVERY to false in the default docker-compose configuration.

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

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

Author: Mateusz Czeladka

.env.docker-compose

@@ -109,7 +109,7 @@ CONTINUE_PARSING_ON_ERROR=true
 SYNC=true
 
 ## Peer Discovery
-PEER_DISCOVERY=true
+PEER_DISCOVERY=false
 
 ## Token Registry
 TOKEN_REGISTRY_ENABLED=false