Can I build my own Substack with AI?

Build a simple newsletter publication similar to Substack for a solo writer.

**Objective:** Publish posts, collect email signups, and send issues to subscribers.

**Target user:** A writer or creator who already has an audience and wants a branded archive without giving Substack a cut.

**Core functionality:**
- Public homepage with latest posts
- Post pages with title, date, and body
- Email signup that saves subscribers
- Admin to write posts and send an issue
- Optional: mark some posts as paid-only (gate the body)

**Pages/screens:**
- Public homepage / archive
- Individual post
- Signup confirmation
- Admin: posts list, editor, subscriber count

**Data model:**
- Post: { id, title, slug, body, publishedAt, isPaid }
- Subscriber: { id, email, status, createdAt }

**Authentication:** Required for the writer admin. Public readers don't need accounts for free posts.

**APIs/integrations:** Email API to send issues. Stripe out of scope for v1.

**Explicit exclusions:** No comments, no iOS app, no recommendation network, no Notes feed in v1.