Scale wheels.dev to 3 replicas

Sessions are now stored in CockroachDB, enabling horizontal scaling.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: bpamiri

deploy/swarm/docker-compose.yml

@@ -4,7 +4,7 @@ services:
   wheels-dev:
     image: ghcr.io/wheels-dev/wheels-dev:latest
     deploy:
-      replicas: 1
+      replicas: 3
       restart_policy:
         condition: on-failure
       update_config: