fix(ai-gateway): add versioned gateway models route

[chrarnoldus]

Summary

Adds a versioned /api/gateway/v1/models Next.js route that reuses the existing OpenRouter models handler, matching the existing unversioned gateway models alias. Adds a regression assertion that the versioned gateway route exports the shared handler.

Verification

N/A - no manual UI flow; this is an API route alias.

Visual Changes

N/A

Reviewer Notes

Local test execution requires the test Postgres service, which was unavailable in this container because Docker is not installed.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

The new /api/gateway/v1/models route is a one-line re-export that exactly matches the existing alias pattern used by other gateway routes, with a straightforward regression test confirming it points at the shared handler.

Files Reviewed (2 files)

• apps/web/src/app/api/gateway/v1/models/route.ts
• apps/web/src/tests/openrouter-models.test.ts

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_{Review guidance: REVIEW.md from base branch main}