Add Monetization

Monetization.md

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+## Tiers
+
+| Tier | Price | Billing |
+|------|-------|---------|
+| Free | $0 | - |
+| Pro | $5/mo or $49/year | Lemon Squeezy |
+
+## Feature Matrix
+
+| Feature | Free | Pro |
+|---------|------|-----|
+| Subdomain (you.writekit.dev) | Yes | Yes |
+| Custom domain | No | Yes |
+| "Powered by WriteKit" badge | Required | Hidden |
+| Analytics retention | 7 days | 90 days |
+| API requests | 100/hour | 1000/hour |
+| Webhooks | 3 endpoints | 10 endpoints |
+| Webhook deliveries | 100/day | 1000/day |
+| Plugins | 3 max | 10 max |
+| Plugin executions | 1000/day | 10000/day |
+| Posts | Unlimited | Unlimited |
+| Assets | Unlimited | Unlimited |
+| Comments/Reactions | Unlimited | Unlimited |
+
+## Upgrade Triggers
+
+1. **Custom domain** - Primary trigger, most valuable to users
+2. **Remove badge** - Secondary, vanity upgrade
+3. **Analytics depth** - 7 days feels limiting for serious bloggers
+4. **Rate limits** - For power users/headless CMS use case
+
+## Positioning
+
+**Tagline:** "Your blog, your domain, your data."
+
+**Key messages:**
+- No paywalls, no algorithms, no surprises
+- 70% cheaper than Ghost ($5 vs $18/mo)
+- Own your content, export anytime
+- API-first, developer-friendly
+
+### Enforcement Points
+
+| Feature | File | Check |
+|---------|------|-------|
+| Custom domain | `server/domain.go` | Block if tier != pro |
+| Badge | Blog templates | Show if tier == free |
+| Analytics | `tenant/analytics.go` | Filter by retention days |
+| API rate limit | `server/middleware.go` | Rate limiter per tier |
+| Webhooks count | `tenant/webhooks.go` | Check on create |
+| Plugins count | `tenant/plugins.go` | Check on create |