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

.gitea/workflows/deploy-beta.yml

@@ -26,8 +26,8 @@ jobs:
           DATABASE_URL: ""
           DB_HOST: ""
           SHORTENER_API_TOKENS: monica:dev-only-token
-          PUBLIC_SHORT_URL: https://go.mkdrealtor.com
-          SHORT_PUBLIC_HOSTS: go.mkdrealtor.com
+          PUBLIC_SHORT_URL: https://piha.lc
+          SHORT_PUBLIC_HOSTS: piha.lc
           SHORT_API_HOSTS: testserver,localhost,127.0.0.1
           SHORT_ALLOWED_HOSTS: mkdrealtor.com
           CLICK_IP_PEPPER: test-pepper
@@ -63,8 +63,8 @@ jobs:
             -e DJANGO_ALLOWED_HOSTS=localhost,127.0.0.1,testserver \
             -e DATABASE_URL=postgres://url_shortener:url_shortener@db:5432/url_shortener \
             -e SHORTENER_API_TOKENS=monica:dev-only-token \
-            -e PUBLIC_SHORT_URL=https://go.mkdrealtor.com \
-            -e SHORT_PUBLIC_HOSTS=go.mkdrealtor.com \
+            -e PUBLIC_SHORT_URL=https://piha.lc \
+            -e SHORT_PUBLIC_HOSTS=piha.lc \
             -e SHORT_API_HOSTS=testserver,localhost,127.0.0.1 \
             -e SHORT_ALLOWED_HOSTS=mkdrealtor.com \
             -e CLICK_IP_PEPPER=test-pepper \