refactor(n8n): simplify update to npm update, clean install deps

Update script:
- Replace aggressive rm + npm install --force with npm update -g n8n
  which is the official recommended way to update n8n
- Keep legacy migration (env file) and ensure_dependencies

Install script:
- Remove unnecessary build-essential, python3, python3-setuptools
  (n8n ships pre-built binaries, no native compilation needed)
- Remove ca-certificates (already provided by base image)
- Remove patch-package (not used)
- Use npm install -g instead of --global for consistency

Closes #12250

ct/n8n.sh

@@ -41,19 +41,5 @@ EOF
   
   NODE_VERSION="22" setup_nodejs
 
-  msg_info "Updating ${APP} LXC"
-  rm -rf /usr/lib/node_modules/.n8n-* /usr/lib/node_modules/n8n
-  $STD npm install -g n8n --force
-  systemctl restart n8n
-  msg_ok "Updated successfully!"
-  exit
-}
-
-start
-build_container
-description
-
-msg_ok "Completed successfully!\n"
-echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
-echo -e "${INFO}${YW} Access it using the following URL:${CL}"
-echo -e "${TAB}${GATEWAY}${BGN}http://${IP}:5678${CL}"
+  msg_info "Updating ${APP}"
+  $STD npm update -g n8n

install/n8n-install.sh

@@ -15,18 +15,13 @@ update_os
 
 msg_info "Installing Dependencies"
 $STD apt install -y \
-  ca-certificates \
-  build-essential \
-  python3 \
-  python3-setuptools \
   graphicsmagick
 msg_ok "Installed Dependencies"
 
 NODE_VERSION="22" setup_nodejs
 
 msg_info "Installing n8n (Patience)"
-$STD npm install --global patch-package
-$STD npm install --global n8n
+$STD npm install -g n8n
 msg_ok "Installed n8n"
 
 msg_info "Creating Service"