feat: rebuild CSP practice workflow, UX and automation

frontend/next.config.ts

@@ -6,8 +6,11 @@ const nextConfig: NextConfig = {
   async rewrites() {
     // Reverse proxy backend under a path prefix, so browser can access backend
     // with same-origin (no CORS): http://<host>:7888/admin139/...
-    const backendInternal = process.env.BACKEND_INTERNAL_URL;
-    if (!backendInternal) return [];
+    const backendInternal =
+      process.env.BACKEND_INTERNAL_URL ??
+      (process.env.NODE_ENV === "development"
+        ? "http://127.0.0.1:8080"
+        : "http://backend:8080");
 
     return [
       {