refactor: make app portable for open source

- Remove hardcoded api.manoonoils.com fetch patch
- Make allowedSaleorUrls configurable via ALLOWED_SALEOR_URLS env var
- Make email logo/company configurable via EMAIL_LOGO_URL, EMAIL_COMPANY_NAME
- Add comprehensive README with deployment docs
- Keep internal networking preference via SALEOR_API_URL env var

src/pages/api/register.ts

@@ -1,21 +1,11 @@
-// Patch fetch to force HTTPS for api.manoonoils.com
-const originalFetch = global.fetch;
-global.fetch = async (input: RequestInfo | URL, init?: RequestInit) => {
-  let url = input.toString();
-  if (url.startsWith('http://api.manoonoils.com/')) {
-    url = url.replace('http://', 'https://');
-    input = url;
-  }
-  return originalFetch(input, init);
-};
-
 import { createAppRegisterHandler } from "@saleor/app-sdk/handlers/next";
 import { saleorApp } from "@/saleor-app";
 
+const allowedSaleorUrls = process.env.ALLOWED_SALEOR_URLS
+  ? process.env.ALLOWED_SALEOR_URLS.split(",").map((url) => url.trim())
+  : ["http://localhost:3000", "https://*.saleor.cloud"];
+
 export default createAppRegisterHandler({
   apl: saleorApp.apl,
-  allowedSaleorUrls: [
-    "https://api.manoonoils.com/graphql/",
-    "http://api.manoonoils.com/graphql/",
-  ],
+  allowedSaleorUrls,
 });