feat(cms): white-label email templates and API doc config (#2)

## Summary

- Replace all hardcoded muellerprints brand identity in email templates with template variables sourced from env vars
- Inject shop context into both `sendInvoice` and `sendDeliveryNote` template calls in `order.ts`
- Make API documentation title/description env-var driven

## New env vars (all optional with safe defaults)

| Var | Default | Used in |
|-----|---------|---------|
| `SHOP_NAME` | `"Shop"` | Email subject, body, footer |
| `SHOP_CONTACT_NAME` | `""` | Email footer |
| `SHOP_ADDRESS` | `""` | Email footer |
| `SHOP_PHONE` | `""` | Email footer |
| `SHOP_EMAIL` | `ADMIN_EMAIL_ADDRESS` | Email footer |
| `SHOP_LOGO_URL` | `""` | Email header logo |
| `SHOP_SECONDARY_LOGO_URL` | `""` | Email footer logo |
| `API_TITLE` | `"Paperwork API"` | Swagger/OpenAPI title |
| `API_DESCRIPTION` | `"Paperwork API"` | Swagger/OpenAPI description |

## Test plan

- [ ] Set `SHOP_NAME=TestShop` and trigger invoice send → confirm subject and body use `TestShop`
- [ ] Leave `SHOP_NAME` unset → confirm default `"Shop"` appears
- [ ] Set `SHOP_LOGO_URL` → confirm logo renders in email header; unset → confirm no broken `<img>` tag
- [ ] Check Strapi admin `/documentation` with `API_TITLE=MyAPI` env var

Closes #1

Reviewed-on: #2
Co-authored-by: Michael Czechowski <mail@dailysh.it>
Co-committed-by: Michael Czechowski <mail@dailysh.it>

CHANGELOG.md

@@ -2,7 +2,26 @@
 
 All notable changes to libreshop/cms are documented here.
 
-## Unreleased
+## [0.1.1] - 2026-04-29
+
+### Changed
+
+- White-label email templates: replace all hardcoded muellerprints company
+  identity (name, contact, address, phone, email, logo URLs) with
+  `<%= shopName %>` / `<%= shopContactName %>` / `<%= shopAddress %>` /
+  `<%= shopPhone %>` / `<%= shopEmail %>` / `<%= shopLogoUrl %>` /
+  `<%= shopSecondaryLogoUrl %>` template variables, sourced from env vars
+  `SHOP_NAME`, `SHOP_CONTACT_NAME`, `SHOP_ADDRESS`, `SHOP_PHONE`,
+  `SHOP_EMAIL`, `SHOP_LOGO_URL`, `SHOP_SECONDARY_LOGO_URL`.
+- `config/constants.ts`: export shop brand constants from env.
+- `src/api/order/services/order.ts`: inject shop context into template calls.
+- `config/plugins.ts`: API doc title/description driven by `API_TITLE` /
+  `API_DESCRIPTION` env vars (defaults: `"Paperwork API"`).
+- `src/extensions/documentation/config/settings.json`: neutral placeholder.
+
+Closes #1
+
+## [0.1.0] - 2026-04-29
 
 - Extracted from `mp/cms/` (2026-04-29). The component history before
   the extraction lives in the `muellerprints` repository.