feat: add ai none to unload AI model before training

train-on-this-server.sh

@@ -3,6 +3,10 @@
 
 set -e
 
+# Unload AI model to free GPU memory
+echo "Unloading AI model..."
+ai none
+
 echo "=== Cyron LoRA Training Setup ==="
 
 # Create venv