Expose IPFS swarm port 4001 for P2P connectivity

Enables full IPFS network participation - other nodes can
discover and fetch content from this node.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -29,6 +29,9 @@ services:
 
   ipfs:
     image: ipfs/kubo:latest
+    ports:
+      - "4001:4001"      # Swarm TCP
+      - "4001:4001/udp"  # Swarm UDP
     volumes:
       - ipfs_data:/data/ipfs
       - l1_cache:/data/cache:ro  # Read-only access to cache for adding files