feat(gateway): serve embedding models from OpenRouter

[kilo-code-bot]

Summary

Follow-up to #3099. The /api/gateway/embedding-models endpoint now proxies the live OpenRouter catalog (output_modalities=embeddings) instead of returning a hardcoded list, mirroring the existing /api/gateway/models endpoint for language models. Clients now see every embedding model OpenRouter exposes (Gemini, Perplexity, Qwen, BAAI, Sentence Transformers, etc.) without us shipping a new release each time the catalog changes.

• Added getOpenRouterEmbeddingModels() in apps/web/src/lib/ai-gateway/providers/openrouter/index.ts that fetches ${OPENROUTER}/models?output_modalities=embeddings, validates with OpenRouterModelsResponseSchema, and reuses the existing attribution headers and Sentry plumbing.
• Rewrote apps/web/src/app/api/gateway/embedding-models/route.ts to call that helper and return the OpenRouter response shape ({ data: [...] }), with a 500 + Sentry capture on failure.

Verification

• curl http://localhost:3000/api/gateway/embedding-models returns the live OpenRouter embeddings catalog.

Visual Changes

N/A

Reviewer Notes

• The response shape changes from the static { defaultModel, models, aliases } catalog to the standard OpenRouterModelsResponse ({ data: OpenRouterModel[] }) used by /api/gateway/models. Any client still relying on the old shape (e.g. the bundled fallback in the kilocode indexing PR) should be updated in lockstep.
• The catalog can be sizeable (~25+ models). The fetch reuses the 60s next.revalidate caching that the language-models endpoint uses.
• apps/web/src/lib/ai-gateway/embeddings/kilo-embedding-models.ts is untouched; it is still consumed by apps/web/src/app/(app)/claw/components/embeddingModels.ts and other internal call sites and can be retired in a separate change once those move to the live endpoint.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• apps/web/src/app/api/gateway/embedding-models/route.test.ts
• apps/web/src/app/api/gateway/embedding-models/route.ts
• apps/web/src/lib/ai-gateway/providers/openrouter/index.ts

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_{Reviewed by gpt-5.5-2026-04-23 · 159,355 tokens}