Release v0.5.0

Deploy Key System & Security Enhancements

Features:
- Deploy key system with IP tracking and 7-day expiration
- One-command agent setup with automatic key exchange
- Secure cluster details page for key management
- Custom SLURM icon with #09a4d6 background
- 14-day default data collection period
- Admin user management stored in database

Security:
- Moved sensitive API keys to dedicated details page
- Deploy key expiration and single-use enforcement
- IP address tracking for deploy key usage
- Improved key rotation workflow

Agent:
- New 'slurm-dashboard setup' command for automated deployment
- GitLab repository installation support
- Extended data collection window to 14 days
- Streamlined configuration process