fix: Add support for external PostgreSQL and Redis instances

Implements smart detection that allows users to provide external DATABASE_URL
or REDIS_URL. When external services are detected, internal instances are
automatically disabled to save resources. Maintains full backward compatibility
with existing setup

docker/unified/supervisord.conf

@@ -7,7 +7,7 @@ loglevel=info
 pidfile=/var/run/supervisord.pid
 
 [program:postgresql]
-command=/usr/lib/postgresql/16/bin/postgres -D /var/lib/postgresql/data
+command=/app/postgres-start.sh
 user=postgres
 autostart=true
 autorestart=true