Changes

Add nginx reverse proxy for /juntete path

- Update nginx config to route /juntete to frontend container
- Add base path configuration to Next.js for production
- Remove direct port 3002 exposure from docker-compose.production.yml
- Set NODE_ENV=production for proper base path handling
- Add upstream block for nginx load balancing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Update to PostgreSQL 18 - Latest stable version

- Upgrade from PostgreSQL 15 to PostgreSQL 18
- Updated all Docker images to postgres:18-alpine
- Updated Jenkinsfile to use PostgreSQL 18
- Updated documentation to reflect latest version
- Validated all configurations work correctly

PostgreSQL 18 includes:
- Performance improvements for ARM64 architecture
- Enhanced parallel query capabilities
- Improved storage efficiency
- Better monitoring and observability features

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

🔒 Fix security vulnerability - Remove hardcoded passwords

CRITICAL SECURITY FIX:
- Remove hardcoded password from docker-compose.yml
- Use environment variables with .env file configuration
- Add .env.example as template for secure setup
- Update Jenkinsfile with security validation checks
- Add comprehensive security documentation
- Update README with security best practices
- Ensure .env is properly gitignored

Security improvements:
- Password validation in Jenkins pipeline
- Environment variable fallbacks with secure defaults
- File permission recommendations
- Container security features maintained
- Production deployment security checklist

No more passwords in plain text! Use .env file for configuration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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