Add CLI flags for setup and server configuration

- Add --setup flag to create admin user
- Add --admin-user and --admin-password for setup
- Generate cryptographically random passwords for --setup
- Add --bind and --port flags for server binding
- Add BIND env var support
- Add SMTP email service for password reset
- Add password reset token storage
- Add auth header to queue/logs frontend pages
- Fix journalctl timestamp format
- Fix logs to return empty array instead of error when no entries
- Fix queue handler to return proper error message
- Hide Users/Aliases nav links when no domain selected

backend/.env

@@ -6,3 +6,10 @@ DB_NAME=mailserver
 JWT_SECRET=change-this-secret-in-production
 ADMIN_USER=admin
 ADMIN_PASSWORD=admin123
+
+SMTP_HOST=localhost
+SMTP_PORT=587
+SMTP_USER=
+SMTP_PASSWORD=
+SMTP_FROM=noreply@localhost
+BASE_URL=http://localhost:8080