Fix ML backend startup issues and improve logging

Address issues with the ML backend not starting correctly due to missing dependencies by ensuring the correct virtual environment is used and improving logging for easier debugging of startup failures.

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attached_assets/Pasted-systemctl-stop-ids-ml-backend-root-ids-systemctl-start-_1771243202583.txt

@@ -0,0 +1,59 @@
+systemctl stop ids-ml-backend
+[root@ids ~]# systemctl start ids-ml-backend
+[root@ids ~]# systemctl status ids-ml-backend
+● ids-ml-backend.service - IDS ML Backend (FastAPI)
+     Loaded: loaded (/etc/systemd/system/ids-ml-backend.service; enabled; preset: disabled)
+     Active: active (running) since Mon 2026-02-16 12:59:19 CET; 4s ago
+   Main PID: 3600 (python3)
+      Tasks: 26 (limit: 100409)
+     Memory: 157.6M (max: 2.0G available: 1.8G)
+        CPU: 3.936s
+     CGroup: /system.slice/ids-ml-backend.service
+             └─3600 /opt/ids/python_ml/venv/bin/python3 main.py
+
+Feb 16 12:59:19 ids.alfacom.it systemd[1]: Started IDS ML Backend (FastAPI).
+[root@ids ~]# cat /etc/systemd/system/ids-ml-backend.service
+[Unit]
+Description=IDS ML Backend (FastAPI)
+After=network.target postgresql-16.service
+Wants=postgresql-16.service
+
+[Service]
+Type=simple
+User=ids
+Group=ids
+WorkingDirectory=/opt/ids/python_ml
+EnvironmentFile=/opt/ids/.env
+
+# Comando esecuzione (usa virtual environment)
+ExecStart=/opt/ids/python_ml/venv/bin/python3 main.py
+
+# Restart automatico sempre (non solo on-failure)
+Restart=always
+RestartSec=10
+StartLimitInterval=300
+StartLimitBurst=5
+
+# Limiti risorse
+LimitNOFILE=65536
+MemoryMax=2G
+
+# Logging
+StandardOutput=append:/var/log/ids/ml_backend.log
+StandardError=append:/var/log/ids/ml_backend.log
+SyslogIdentifier=ids-ml-backend
+
+[Install]
+WantedBy=multi-user.target
+[root@ids ~]# tail -f /var/log/ids/backend.log
+🚀 Starting IDS API on http://0.0.0.0:8000
+📚 Docs available at http://0.0.0.0:8000/docs
+[Mon Feb 16 12:56:12 CET 2026] Backend Python NON attivo, riavvio...
+[Mon Feb 16 12:56:14 CET 2026] Backend riavviato con PID: 3453
+Traceback (most recent call last):
+  File "/opt/ids/python_ml/main.py", line 21, in <module>
+    from ml_hybrid_detector import MLHybridDetector
+  File "/opt/ids/python_ml/ml_hybrid_detector.py", line 13, in <module>
+    from xgboost import XGBClassifier
+ModuleNotFoundError: No module named 'xgboost'
+