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>

src/api/order/services/order.ts

@@ -3,7 +3,7 @@ import fs from "fs";
 import { factories } from "@strapi/strapi";
 import { sanitize } from "@strapi/utils";
 import { ID } from "@strapi/database/dist/types";
-import { vatDecimal, vatIncludedDecimal, baseUrl, adminEmail } from "../../../../config/constants";
+import { vatDecimal, vatIncludedDecimal, baseUrl, adminEmail, shopName, shopContactName, shopAddress, shopPhone, shopEmail, shopLogoUrl, shopSecondaryLogoUrl } from "../../../../config/constants";
 import { calculateTotalProductPrice, productDefaultParams } from "../../product/services/product";
 import { CartProduct, Order, PdfBody } from "../../../../types";
 import { pdfApi } from "../../../services/PdfApi";
@@ -81,12 +81,13 @@ export default factories.createCoreService("api::order.order", ({ strapi }) => (
 		strapi.log.info(`app:i:order-service: - Sending invoice for order ${uuid}`);
 		const oderUnsafe = (await strapi.service("api::order.order").findOneByUuid(uuid)) as Partial<Order>;
 
+		const shopContext = { shopName, shopContactName, shopAddress, shopPhone, shopEmail, shopLogoUrl, shopSecondaryLogoUrl };
 		try {
 			const emailConfig: MessageBody = {
 				to_email: oderUnsafe.email,
-				subject: template(invoiceEmailTemplate.subject)(oderUnsafe),
-				message: template(invoiceEmailTemplate.text)({ baseUrl, ...oderUnsafe }),
-				html: template(invoiceEmailTemplate.html)({ baseUrl, ...oderUnsafe })
+				subject: template(invoiceEmailTemplate.subject)({ ...shopContext, ...oderUnsafe }),
+				message: template(invoiceEmailTemplate.text)({ baseUrl, ...shopContext, ...oderUnsafe }),
+				html: template(invoiceEmailTemplate.html)({ baseUrl, ...shopContext, ...oderUnsafe })
 			};
 
 			strapi.log.debug(`app:d:order-service: - Email config ${emailConfig.html}`);
@@ -118,12 +119,13 @@ export default factories.createCoreService("api::order.order", ({ strapi }) => (
 	sendDeliveryNote: async (uuid: string, blob?: ArrayBuffer) => {
 		strapi.log.info(`app:i:order-service: - Sending delivery note for order ${uuid}`);
 		const oderUnsafe = (await strapi.service("api::order.order").findOneByUuid(uuid)) as Partial<Order>;
+		const shopContext = { shopName, shopContactName, shopAddress, shopPhone, shopEmail, shopLogoUrl, shopSecondaryLogoUrl };
 		try {
 			const emailConfig: MessageBody = {
 				to_email: oderUnsafe.email,
-				subject: template(deliveryNoteEmailTemplate.subject)(oderUnsafe),
-				message: template(deliveryNoteEmailTemplate.text)(oderUnsafe),
-				html: template(deliveryNoteEmailTemplate.html)({ ...oderUnsafe, baseUrl })
+				subject: template(deliveryNoteEmailTemplate.subject)({ ...shopContext, ...oderUnsafe }),
+				message: template(deliveryNoteEmailTemplate.text)({ ...shopContext, ...oderUnsafe }),
+				html: template(deliveryNoteEmailTemplate.html)({ baseUrl, ...shopContext, ...oderUnsafe })
 			};
 			await mailApi.sendTextMessage(emailConfig);
 			strapi.log.info(`app:i:order-service: ✔ Sending delivery note for order ${uuid}`);