Add Vercel AI Gateway provider support (#1183)

src/app/api/providers/[id]/models/route.js

@@ -239,6 +239,7 @@ const PROVIDER_MODELS_CONFIG = {
   chutes: createOpenAIModelsConfig("https://llm.chutes.ai/v1/models"),
   nvidia: createOpenAIModelsConfig("https://integrate.api.nvidia.com/v1/models"),
   assemblyai: createOpenAIModelsConfig("https://api.assemblyai.com/v1/models"),
+  "vercel-ai-gateway": createOpenAIModelsConfig("https://ai-gateway.vercel.sh/v1/models"),
 
   // Custom resolvers (non-OpenAI-shaped APIs / token-refresh flows)
   kiro: {