Allow all recommended model for Vercel routing

[chrarnoldus]

No description provided.

[kiloconnect]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Overview

This PR adds Alibaba/Qwen provider support for Vercel routing and replaces the hardcoded VERCEL_ROUTING_ALLOW_LIST with the shared preferredModels list. Key changes:

• Alibaba provider added to OpenRouterInferenceProviderIdSchema and VercelNonUserByokInferenceProviderIdSchema, with qwen prefix mapping to alibaba.
• Type widening from VercelUserByokInferenceProviderId to VercelInferenceProviderId in the model-prefix mapping and inferVercelFirstPartyInferenceProviderForModel return type — correctly accommodating non-BYOK providers.
• Safe BYOK filtering via VercelUserByokInferenceProviderIdSchema.safeParse() in inferUserByokProviderForModel — a good defensive pattern that prevents non-BYOK providers (like alibaba) from being returned as BYOK provider IDs.
• Routing logic restructured in shouldRouteToVercel to check isOpenRouterModel upfront for all paths (not just universal routing), which is more correct.
• Removed stale model mappings (google/gemini-3-flash-preview, mistralai/devstral-2512:free) from vercelModelIdMapping — safe since these models either aren't in preferredModels or Vercel now supports the original model names.

Files Reviewed (2 files)

• src/lib/providers/openrouter/inference-provider-id.ts - 0 issues
• src/lib/providers/vercel.ts - 0 issues