Can I vibecode Livestorm?

Extend the webinar platform in this folder. Requirements:

- Two email templates per webinar in the admin (Markdown with {{name}}, {{title}},
  {{replay_url}}): one for registrants who attended 2 minutes or more, one for the rest.
- When the replay is published, queue the right template per registrant, send through the
  existing SMTP settings at most 30 per minute, and record sent_at in SQLite.
- A "send test to me" button, a preview with sample data, and a footer line with a
  one-click unsubscribe link that adds the address to a suppression table.
- Never email anyone on the suppression list, and show counts of sent, skipped and failed.
- Update the README.

Add an embeddable registration form to the webinar platform in this folder. Requirements:

- A script tag at /embed.js that renders the form for a given webinar slug inside a shadow
  root, so site CSS can't break it, with name, email and a consent checkbox from settings.
- A POST /api/register endpoint with CORS limited to an ALLOWED_ORIGINS list in .env, a
  honeypot field and a rate limit of 5 requests per minute per IP.
- On success show the join date in the visitor's time zone and send the confirmation email.
- An admin page that shows the copy-paste snippet for each webinar.
- Update the README.

Add a rehearsal room and a tech check to the webinar platform in this folder. Requirements:

- A private room at /rehearse/<slug> that only speaker tokens can open, with its own
  LiveKit room name, never recorded, and never visible to registrants.
- A pre-join check page for everyone: camera and microphone permission, a 10-second
  loopback test, and a report of whether UDP works or only the TCP fallback connects.
- Show the host a table of speakers who passed or failed the check, with the reason.
- Update the README with a pre-event checklist.

Add outgoing webhooks to the webinar platform in this folder. Requirements:

- Admin settings for one webhook URL and a secret; events: registered, joined, left,
  question_asked and replay_viewed, each a small JSON body with an event id and timestamp.
- Sign every request with an HMAC-SHA256 header over the raw body, and retry failures with
  exponential backoff up to 6 times, stored in an outbox table in SQLite.
- A log page with the last 200 deliveries, their status codes and a replay button.
- Update the README with a sample receiver in Node.