#18806: docs: add AWS VPC setup guide for OpenClaw

## Summary - Adds a complete AWS VPC + EC2 setup guide for deploying OpenClaw - Covers VPC creation, EC2 launch, Node.js/ffmpeg install, auth profiles, whisper-cpp local transcription, systemd service, and SSH tunneling - Based on a real deployment walkthrough ## Test plan - [ ] Verify doc renders correctly on Mintlify - [ ] Follow guide on a fresh AWS account to confirm steps 🤖 Generated with [Claude Code](https://claude.com/claude-code)