Vercel AI Gateway 模型供应商

Codex 兼容入口是 ai-gateway.vercel.sh/codex/v1，wire_api = responses，env_key = AI_GATEWAY_API_KEY。再用 vercel.config.toml 和 --profile vercel。不是 Vercel MCP。

[model_providers.vercel]
name = "Vercel AI Gateway"
base_url = "https://ai-gateway.vercel.sh/codex/v1"
env_key = "AI_GATEWAY_API_KEY"
wire_api = "responses"