Improve the system setup and database management for the application

Removes the explicit declaration of `regisflow-network` in `docker-compose.yml`, updates `drizzle-kit push:pg` to `drizzle-kit push` in `docker-entrypoint.sh`, and adds attached assets.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 91318273-c764-4fd4-be04-bdc12c38af32
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/6e755801-08e8-4492-805e-ac3610de5a2a.jpg

docker-entrypoint.sh

@@ -15,7 +15,7 @@ echo "✅ Base de données prête!"
 
 # Exécuter les migrations de base de données
 echo "🔄 Exécution des migrations..."
-npx drizzle-kit push:pg
+npx drizzle-kit push
 
 # Créer le répertoire des sauvegardes s'il n'existe pas
 mkdir -p /app/backups