chore(scripts): check for existing Python installation

scripts/install-python.sh

@@ -3,6 +3,11 @@
 # Usage: sudo ./install-python.sh
 set -euo pipefail
 
+if command -v python3 >/dev/null 2>&1; then
+    echo "ℹ️ Python $(python3 --version) is already installed"
+    exit 0
+fi
+
 apt update
 apt install -y python3