Add TRAEFIK_PRIORITY support for multi-instance deployments

.env.example

@@ -40,6 +40,14 @@ COMPOSE_PROJECT_NAME=hub
 # Used by docker-compose.traefik.yml to configure routing rules
 # TRAEFIK_DOMAIN=meshcore.example.com
 
+# Router priority for Traefik (higher = matched first)
+# Use a higher value for more specific subdomain instances to avoid
+# conflicts with wildcard routes from other instances on the same host.
+#   Production:  10 (default)
+#   Staging:     20
+#   MQTT broker: 30
+# TRAEFIK_PRIORITY=10
+
 # Docker image version tag to use
 # Options: latest, main, v1.0.0, etc.
 IMAGE_VERSION=latest