fix: og image error

[dcrawbuck]

This fixes OG image generation failures in Cloudflare runtime for /docs/og routes.
The OG renderer now avoids fs.readFile at request time and uses a request-derived static logo URL instead.
Route handlers for docs, SDK, and AI OG endpoints now pass logoUrl into renderOgImage.
Verified: the previously failing OG URL returns 200 in OpenNext Cloudflare preview, and both bun run build:cf and bun test pass.

---

Note

Low Risk
Small, localized changes to OG image rendering and route handlers; main risk is visual regressions (font/logo loading) rather than data or security impact.

Overview
Fixes OG image generation failures in Cloudflare by removing runtime fs/font/logo file reads from renderOgImage and switching to a URL-based logo source.

Updates the /og/ai, /og/sdk, and /og/docs/[...slug] route handlers to accept the incoming Request, build an absolute logoUrl from req.url, and pass it through to renderOgImage (which now also uses a system font stack and drops embedded font config).

^{Written by Cursor Bugbot for commit ff2b05a. This will update automatically on new commits. Configure here.}