piha.lc / beta.piha.li + company_site marketing landing (#4)

## Summary

- Public short domain is **`piha.lc`** (prod) and **`beta.piha.li`** (beta)
- `/` is a marketing page in [aimloperations.com](https://aimloperations.com) / `company_site` styling (Inter, dark, cyan)
- CTA: want access → [contact](https://aimloperations.com/contact)
- Nav/logo/footer match the company site; debug mint form uses the same chrome

Closes #3.

## Secrets (control node)

Update hostnames only — no new token/pepper unless you are rotating:

**`url_shortening_service_prod.env`**
```text
DJANGO_ALLOWED_HOSTS=piha.lc,shortener.aimloperations.com,url-shortener,web
SHORT_DOMAIN=piha.lc
PUBLIC_SHORT_URL=https://piha.lc
SHORT_PUBLIC_HOSTS=piha.lc
CONTACT_URL=https://aimloperations.com/contact
```

**`url_shortening_service_beta.env`**
```text
DJANGO_ALLOWED_HOSTS=beta.piha.li,shortener-beta.aimloperations.com,url-shortener,web
SHORT_DOMAIN=beta.piha.li
PUBLIC_SHORT_URL=https://beta.piha.li
SHORT_PUBLIC_HOSTS=beta.piha.li
CONTACT_URL=https://aimloperations.com/contact
```

NPM: `piha.lc` / `beta.piha.li` → this container. Still do not proxy `/api/` on the short host.

## Test plan
- [ ] `cd site && uv run python manage.py test`
- [ ] `GET /` looks like aimloperations.com; Request access / Contact go to aimloperations.com/contact
- [ ] `GET /<code>` still 302
- [ ] `/api/` on Host `piha.lc` is 404

Reviewed-on: #4

docker-compose.yml

@@ -28,7 +28,7 @@ services:
       DATABASE_URL: ${COMPOSE_DATABASE_URL:-postgres://url_shortener:url_shortener@db:5432/url_shortener}
       SHORT_DOMAIN: ${SHORT_DOMAIN:-localhost:8005}
       PUBLIC_SHORT_URL: ${PUBLIC_SHORT_URL:-http://127.0.0.1:8005}
-      SHORT_PUBLIC_HOSTS: ${SHORT_PUBLIC_HOSTS:-go.mkdrealtor.com}
+      SHORT_PUBLIC_HOSTS: ${SHORT_PUBLIC_HOSTS:-piha.lc}
       SHORT_API_HOSTS: ${SHORT_API_HOSTS:-localhost,127.0.0.1,0.0.0.0,web,url-shortener}
       SHORTENER_API_TOKENS: ${SHORTENER_API_TOKENS:-monica:dev-only-token}
       SHORT_ALLOWED_HOSTS: ${SHORT_ALLOWED_HOSTS:-mkdrealtor.com,aimloperations.com}