Add vLLM + LiteLLM support; rename script; add README

- Replace Ollama (disabled by default) with vLLM Docker container +
  LiteLLM Anthropic-API proxy as the default inference backend
- vLLM setup: pulls vllm/vllm-openai, starts container on port 11434,
  polls until model is loaded (up to 10 min for first 45 GB download)
- LiteLLM setup: installs in Python venv, writes config mapping Claude
  model aliases to the vLLM model, runs as a systemd service on port 4000
- New CLI flags on `create`: --vllm/--no-vllm, --ollama/--no-ollama to
  override config at runtime
- New `test` command: end-to-end inference test over WireGuard against
  vLLM (/v1/models + /v1/chat/completions) and LiteLLM (/v1/messages)
- UFW rules now open both port 11434 (inference) and 4000 (LiteLLM)
  from the WireGuard subnet
- Rename hyperstack_vm.rb → hyperstack.rb
- Add README.md with quickstart, Claude Code / OpenCode usage, CLI
  reference, monitoring commands, and VRAM sizing notes
- Add vllm-setup.txt: detailed manual setup notes and architecture docs

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

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