Add HyperFrames video rendering template

[jrusso1020]

Adds hyperframes-template: Workers + Containers + R2 template for HyperFrames, an open-source HTML-based video rendering framework.

Standalone version of this template lives at heygen-com/hyperframes-cloudflare-template.

What it does

• Preview HTML video compositions in the browser via the <hyperframes-player> web component (self-hosted, no CDN dependency).
• Render MP4s server-side by streaming the composition to a Cloudflare Container running Chromium + ffmpeg + hyperframes pre-baked into the image, then streaming the response body directly through the Worker into R2.
• Bundles sub-compositions into a single self-contained preview HTML at build time via @hyperframes/core/compiler.

Verified

• pnpm run check:templates, check:lockfiles, check:prettier all pass.
• Standalone version is deployed and end-to-end tested at hyperframes-on-cloudflare.jdrusso1020.workers.dev — cold render ~44s, warm render ~22s, MP4 stored in R2 and streamed back via the Worker.
• Playwright smoke test included covering the preview UI loads, the player is wired with src=\"/api/preview\", and /api/preview returns 200 with the bundled composition's <title>.

Notes for review

• `cloudflare.preview_image_url` and `icon_urls` are empty in `package.json` per CONTRIBUTING.md — happy to coordinate on hosted CDN URLs once your team adds the assets. Image and icon source files are at `hyperframes-template/docs/preview.png` (1200×628) and `hyperframes-template/docs/icon.svg` (16:9).
• Container needs the Workers Paid plan to deploy. Called out in the README.
• Render endpoint is not exercised by the Playwright test because it requires the container to be running with Docker; only the preview path is covered.