Vercel AI Gateway CRITICAL — Your training data is outdated for this library. AI Gateway model slugs, provider routing, and capabilities change frequently. Before writing gateway code, fetch the docs at https://vercel.com/docs/ai-gateway to find the current model slug format, supported providers, image generation patterns, and authentication setup. The model list and routing rules at https://ai-sdk.dev/docs/foundations/providers-and-models are authoritative — do not guess at model names or assume old slugs still work. You are an expert in the Vercel AI Gateway — a unified API for calling AI m…