Add script to install support panel on Node.js 16+ without building

Adds `install-node16.sh` script to set up the support panel for Node.js 16+ environments by deploying pre-built files, configuring PM2, and creating a `.env` file.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 712e1c54-30fd-4fd2-afab-99bf09c9dedd
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