createAiBindingFetch (api/cloudflare-ai-binding.ts)

Creates a fetch function backed by Cloudflare AI binding for seamless requests.

// Source: https://github.com/earendil-works/pi | License: MIT | Copyright 2025 Mario Zechner
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * AI Gateway transport over the Workers AI binding.
 *
 * pi's Cloudflare AI Gateway support speaks HTTPS
 * (`gateway.ai.cloudflare.com/v1/{account}/{gateway}/{provider}/...`, see `api/cloudflare.ts`),
 * which needs a Cloudflare API token even when the caller is a Worker in the gateway's own
 * account.
 *
 * A Worker avoids that token by talking to the gateway through the AI binding's `fetch`
 * passthrough (`env.AI.fetch()`), which serves the gateway's provider passthrough at
 * `https://workers-binding.ai/ai-gateway/gateways/{gateway}/{provider}/{endpoint...}` — the same
 * shape as the HTTPS URL, minus the account id (the 

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