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

site/shortener/settings/base.py

@@ -89,7 +89,7 @@ DEBUG = env_bool("DJANGO_DEBUG", False)
 
 allowed_hosts = env_list(
     "DJANGO_ALLOWED_HOSTS",
-    "localhost,127.0.0.1,0.0.0.0,testserver,web,url-shortener,go.mkdrealtor.com",
+    "localhost,127.0.0.1,0.0.0.0,testserver,web,url-shortener,piha.lc,beta.piha.li",
 )
 ALLOWED_HOSTS = allowed_hosts if allowed_hosts else ["*"]
 
@@ -176,7 +176,7 @@ DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
 
 # --- Shortener ---
 SHORT_DOMAIN = env("SHORT_DOMAIN", "localhost:8000") or "localhost:8000"
-PUBLIC_SHORT_URL = (env("PUBLIC_SHORT_URL", "https://go.mkdrealtor.com") or "").rstrip(
+PUBLIC_SHORT_URL = (env("PUBLIC_SHORT_URL", "https://piha.lc") or "").rstrip(
     "/"
 )
 SHORT_PUBLIC_HOSTS = env_list("SHORT_PUBLIC_HOSTS", SHORT_DOMAIN.split(":")[0])
@@ -196,3 +196,6 @@ CODE_ALPHABET = "23456789abcdefghjkmnpqrstuvwxyz"
 SITE_NAME = env("SITE_NAME", "URL Shortening Service") or "URL Shortening Service"
 CREDIT_NAME = env("CREDIT_NAME", "AI ML Operations") or "AI ML Operations"
 CREDIT_URL = env("CREDIT_URL", "https://aimloperations.com") or "https://aimloperations.com"
+CONTACT_URL = env("CONTACT_URL", "https://aimloperations.com/contact") or (
+    "https://aimloperations.com/contact"
+)