Add copy-to-clipboard for crypto payment amounts and addresses.

Mount storefront JS assets, hide copy controls without JavaScript, and load per-page copy handling on checkout and order views.

backend/src/main.ts

@@ -8,8 +8,10 @@ import path from 'node:path';
 import {
     getStorefrontCssDir,
     getStorefrontImgDir,
+    getStorefrontJsDir,
     storefrontCssUrlPrefix,
-    storefrontImgUrlPrefix
+    storefrontImgUrlPrefix,
+    storefrontJsUrlPrefix
 } from './config/storefrontAssetPaths';
 import { getPublicUploadsDir, publicUploadsUrlPrefix } from './config/uploadPaths';
 import { AppModule } from './AppModule';
@@ -42,6 +44,10 @@ async function bootstrap() {
         prefix: storefrontCssUrlPrefix
     });
 
+    app.useStaticAssets(getStorefrontJsDir(), {
+        prefix: storefrontJsUrlPrefix
+    });
+
     app.use(cookieParser());
 
     if (nodeEnv === NodeEnv.Production) {