[DOC] Update production-stack.md

[elieserr]

Update api versions used to test

Purpose

Minor fix on documentation to reflect proper endpoints for testing production-stack.md

Test Plan

Test Result

Old

curl -o- http://localhost:30080/models
{"detail":"Not Found"}

curl -X POST http://localhost:30080/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "facebook/opt-125m",
    "prompt": "Once upon a time,",
    "max_tokens": 10
  }'
{"detail":"Not Found"}

New

curl -o- http://localhost:30080/v1/models
{"object":"list","data":[{"id":"facebook/opt-125m","object":"model","created":1759504980,"owned_by":"vllm","root":null,"parent":null}]}

curl -X POST http://localhost:30080/v1/completions   -H "Content-Type: application/json"   -d '{
    "model": "facebook/opt-125m",
    "prompt": "Once upon a time,",
    "max_tokens": 10
  }' | jq
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   516  100   421  100    95    697    157 --:--:-- --:--:-- --:--:--   855
{
  "id": "cmpl-dbc8b3fdfaf34aa5990e6e00737c22ba",
  "object": "text_completion",
  "created": 1759505157,
  "model": "facebook/opt-125m",
  "choices": [
    {
      "index": 0,
      "text": " an American joke was jumbled into something equally silly",
      "logprobs": null,
      "finish_reason": "length",
      "stop_reason": null,
      "prompt_logprobs": null
    }
  ],
  "usage": {
    "prompt_tokens": 6,
    "total_tokens": 16,
    "completion_tokens": 10,
    "prompt_tokens_details": null
  },
  "kv_transfer_params": null
}

---

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[github-actions]

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[gemini-code-assist]

Code Review

This pull request updates the production-stack.md documentation file to reflect the correct API endpoints. The changes from /models to /v1/models and /completions to /v1/completions are accurate and align with the server's routing implementation. This is a helpful correction to the documentation.