Update the application's production environment for enhanced performance

Refactors the Docker setup, upgrades Node.js and PostgreSQL versions, and improves security.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 4b008663-bd72-492b-b0b6-fa252367e730
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/4b008663-bd72-492b-b0b6-fa252367e730/6nnsA2m

.env.production.example

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+# Configuration de Production RegisFlow 2025
+# Copiez ce fichier en .env.production et modifiez les valeurs
+
+# Base de données PostgreSQL
+POSTGRES_PASSWORD=RegisFlow2025!PostgreSQL_CHANGEME
+POSTGRES_PORT=5433
+
+# Application
+APP_PORT=5000
+SESSION_SECRET=RegisFlow2025SessionSecretKey_CHANGEME_MINIMUM_32_CHARACTERS
+NODE_ENV=production
+TZ=Europe/Paris
+
+# Sécurité
+SECURE_COOKIES=true
+LOG_LEVEL=info
+
+# Limites et rétention
+DATA_RETENTION_MONTHS=19
+BACKUP_RETENTION_DAYS=90
+MAX_BACKUP_COUNT=20
+PHOTO_STORAGE_LIMIT=10485760
+
+# Déployment optionnel avec réseau nginx
+# Décommentez si vous utilisez un reverse proxy
+# networks:
+#   default:
+#     external: true
+#     name: nginx_default