fix: add DB wait-for-ready logic and explicit network names

- start-with-migrate.js now waits for the database TCP port to be
  reachable before running Prisma migrations (15 retries, 2s interval).
  Prevents the container from crashing and restarting in a loop when
  postgres is still starting up.
- Add explicit 'name:' to both production and dev compose networks
  to prevent docker-compose project prefix mismatch.

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

docker-compose.production.yml

@@ -113,6 +113,7 @@ volumes:
 
 networks:
   portfolio_net:
+    name: portfolio_net
     driver: bridge
   proxy:
     external: true