Add vLLM model presets and live model switching

- New [vllm.presets.*] TOML section with two presets:
    qwen3-coder-next  bullpoint/Qwen3-Coder-Next-AWQ-4bit (256k ctx, coding)
    nemotron-super    solidrust/Llama-3.3-Nemotron-Super-49B-v1-AWQ (131k ctx, analysis)
- New CLI subcommand: `model list` — show presets, mark the active one
- New CLI subcommand: `model switch PRESET [--dry-run]` — switch the
  running VM to a different preset without redeploying:
    1. stops old Docker container (if container_name differs)
    2. starts new container and waits for model readiness
    3. hot-reloads LiteLLM config via litellm_reload_script (no venv reinstall)
    4. updates state file with new vllm_model / vllm_container_name / vllm_preset
- New `create --model PRESET` flag — deploy with a non-default preset
- vllm_install_script and litellm_install_script now accept preset_config:/
  model_override: so callers can override individual fields without
  duplicating the full config
- State file now tracks vllm_container_name and vllm_preset for clean
  container lifecycle management across switches

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

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