fix(inferx): update api endpoint to endpoints/v1

[Prashanth-InferX]

This PR updates the base API URL to point directly to our endpoint routing at https://model.inferx.net/endpoints/v1. This change aligns the registry calls with our actual backend endpoint structure.

You can verify the valid endpoint configuration base under our official developer documentation here: https://model.inferx.net/endpoints

[github-actions]

Action items

• [low] [possible mistake] providers/inferx/provider.toml:4 - Check: Provider API endpoint change requires a supporting citation. Why: The PR body is empty and the api value is changed from https://model.inferx.net/v1 to https://model.inferx.net/endpoints/v1, a material factual change that determines the base URL consumers use to call InferX. The new value is internally consistent with the existing doc = "https://model.inferx.net/endpoints" and the author is affiliated with InferX, but no first-party API reference is cited to confirm the exact /endpoints/v1 path. Action: Add a link to InferX's API documentation (the existing doc URL or an API reference) in the PR body that confirms the correct base endpoint, so the change can be reviewed against the provider's own specification.

[Prashanth-InferX]

Thanks so much for merging the initial provider setup earlier—really appreciate it! This is just a quick, one-line configuration update to align the API path with our direct /endpoints/v1 routing so everything runs smoothly. Ready for review when you have a quick second!