Add extra_vllm_args support; fix nemotron-super to real 120B; add deepseek-r1-32b, qwen3-32b, devstral presets

- hyperstack.rb: add extra_vllm_args array field to preset resolver and
  vllm_install_script; flags are appended verbatim to the docker run command,
  enabling per-preset vLLM flags (reasoning parsers, Mistral loader)
- hyperstack.rb: show extra_args in dry-run model switch output
- hyperstack-vm.toml: fix nemotron-super to use actual NVIDIA Nemotron-3-Super-120B-A12B
  AWQ (cyankiwi) with trust_remote_code=true; previous preset incorrectly used llama-3.3-70b
- hyperstack-vm.toml: add deepseek-r1-32b (--reasoning-parser deepseek_r1, ~18 GB)
- hyperstack-vm.toml: add qwen3-32b (--reasoning-parser deepseek_r1, ~18 GB)
- hyperstack-vm.toml: add devstral (Mistral tokenizer+config format, ~15 GB); --load_format
  mistral omitted because AWQ weights are in standard HF safetensors format
All 6 new/updated presets end-to-end tested on A100 80GB (vLLM 0.17.1).

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

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