feat(FN-006): add production deployment configuration

- Create docker-compose.prod.yml with Traefik, API, web, and DB services
- Add Portainer stack deployment files
- Configure Let's Encrypt TLS and health checks
- Add deployment environment variable examples
- Update portainer.env.example with additional config vars

deploy/.env.example

@@ -0,0 +1,27 @@
+# Production Environment Variables
+# Copy to .env and fill in all values
+
+# Domain Configuration
+ROOT_DOMAIN=example.com
+ACME_EMAIL=admin@example.com
+
+# Database
+POSTGRES_USER=headquarter
+POSTGRES_PASSWORD=change-me-in-production
+POSTGRES_DB=headquarter
+
+# Authentik OIDC
+AUTHENTIK_ISSUER_URL=https://auth.example.com/application/o/headquarter/
+AUTHENTIK_CLIENT_ID=headquarter-api
+AUTHENTIK_CLIENT_SECRET=change-me-in-production
+
+# API Configuration
+SECRET_ENCRYPTION_KEY=change-me-in-production
+ACCESS_TOKEN_EXPIRE_MINUTES=60
+
+# Deployment
+TRAEFIK_LOG_LEVEL=INFO
+API_TAG=latest
+WEB_TAG=latest
+REGISTRY=ghcr.io
+REPO=headquarter