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

API.md

@@ -3,13 +3,13 @@
 For other services (`monica_site`, later callers) that mint short links.
 
 This service has two public hostnames. **Call the API host.** Never create links
-on the short domain (`aiml.pw` / `cidinn.li` / `go.mkdrealtor.com`). That host
+on the short domain (`piha.lc` / `beta.piha.li`). That host
 only serves `GET /` (landing) and `GET /<code>` (302). `/api/` there is **404**.
 
 | Host | Example | What you call |
 |------|---------|----------------|
 | API | `https://shortener.aimloperations.com` | `POST/GET /api/links/` |
-| Short | `https://aiml.pw` (or `cidinn.li`) | phones only — `GET /<code>` |
+| Short | `https://piha.lc` (beta: `https://beta.piha.li`) | phones only — `GET /<code>` |
 
 Local compose: API + redirects on `http://127.0.0.1:8005`.
 
@@ -147,7 +147,7 @@ Content-Type: application/json
 ```json
 {
   "code": "a3k9xm",
-  "short_url": "https://aiml.pw/a3k9xm",
+  "short_url": "https://piha.lc/a3k9xm",
   "target_url": "https://mkdrealtor.com/listings/oak-st?utm_source=monica&utm_medium=sms",
   "title": "Oak St listing",
   "is_active": true,