Replace individual provider SDKs (@ai-sdk/openai, @ai-sdk/google,
@ai-sdk/anthropic) with the Vercel AI Gateway. Cloud models are now
accessed via a single AI_GATEWAY_API_KEY with provider/model strings
(e.g. openai/gpt-4o-mini, google/gemini-2.5-flash). Ollama remains
available as a local fallback via @ai-sdk/openai-compatible.
Made-with: Cursor
