OpenAPI auto generated path params not merged correctly

[amandesai01]

Environment

Nitro 2.12.4
Node v22.13.1

Reproduction

Step 1:
use definePageMeta in any route.

Step 2:
make sure that openAPI object contains parameters array, even if empty.
/api/{projectId}/index.get.ts

openAPI: {
    description: 'Get a specific project by ID',
    tags: ['projects'],
    summary: 'Get project by ID',
    operationId: 'getProjectById',
    parameters: [],
  }

Step 3:
Open swagger docs and notice that path variable is not auto-populated.

Describe the bug

Nitro has this feature of auto detecting API path variables and populating them as path parameters in Open API spec. However, this feature is not working as intended.

Additional context

This can be easily fixed. Just use DEFU!!!

Logs

[amandesai01]

I will raise a PR for this.

[amandesai01]

Here is what I am planning to do:

1. Fix this feature (of course)
2. Do tests exist for this? If yes, planning to cover this case as well.
3. Write better docs for everything OpenAPI.