Add build-essential and python3 dependencies

Ensure build-essential and python3 are installed as prerequisites. ct/pangolin.sh now calls ensure_dependencies for these packages before setting up Node.js, and install/pangolin-install.sh adds them to the apt install list so build/runtime requirements are present during install.

ct/pangolin.sh

@@ -29,6 +29,8 @@ function update_script() {
     exit
   fi
 
+  ensure_dependencies build-essential python3
+
   NODE_VERSION="24" setup_nodejs
 
   if check_for_gh_release "pangolin" "fosrl/pangolin"; then

install/pangolin-install.sh

@@ -15,6 +15,8 @@ update_os
 
 msg_info "Installing Dependencies"
 $STD apt install -y \
+  build-essential \
+  python3 \
   sqlite3 \
   iptables
 msg_ok "Installed Dependencies"