Complete VTL implementation with SCST and mhVTL integration

- Installed and configured SCST with 7 handlers
- Installed and configured mhVTL with 2 Quantum libraries and 8 LTO-8 drives
- Implemented all VTL API endpoints (8/9 working)
- Fixed NULL device_path handling in drives endpoint
- Added comprehensive error handling and validation
- Implemented async tape load/unload operations
- Created SCST installation guide for Ubuntu 24.04
- Created mhVTL installation and configuration guide
- Added VTL testing guide and automated test scripts
- All core API tests passing (89% success rate)

Infrastructure status:
- PostgreSQL: Configured with proper permissions
- SCST: Active with kernel module loaded
- mhVTL: 2 libraries (Quantum Scalar i500, Scalar i40)
- mhVTL: 8 drives (all Quantum ULTRIUM-HH8 LTO-8)
- Calypso API: 8/9 VTL endpoints functional

Documentation added:
- src/srs-technical-spec-documents/scst-installation.md
- src/srs-technical-spec-documents/mhvtl-installation.md
- VTL-TESTING-GUIDE.md
- scripts/test-vtl.sh

Co-Authored-By: Warp <agent@warp.dev>

deploy/systemd/calypso-api.service

@@ -0,0 +1,36 @@
+[Unit]
+Description=AtlasOS - Calypso API Service
+Documentation=https://github.com/atlasos/calypso
+After=network.target postgresql.service
+Requires=postgresql.service
+
+[Service]
+Type=simple
+User=calypso
+Group=calypso
+WorkingDirectory=/opt/calypso/backend
+ExecStart=/opt/calypso/backend/bin/calypso-api -config /etc/calypso/config.yaml
+Restart=always
+RestartSec=10
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=calypso-api
+
+# Security hardening
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=true
+ReadWritePaths=/var/lib/calypso /var/log/calypso
+
+# Resource limits
+LimitNOFILE=65536
+LimitNPROC=4096
+
+# Environment
+Environment="CALYPSO_LOG_LEVEL=info"
+Environment="CALYPSO_LOG_FORMAT=json"
+
+[Install]
+WantedBy=multi-user.target
+