fix(ssr): enable static route rendering and fix self-import in server.ts

- Add AngularAppEngine.ɵallowStaticRouteRender flag so the engine serves
  prerendered static HTML from disk instead of falling back to SSR
- Rename default export to named const (requestHandler) to avoid self-import
  loop when the module is the entry point
- Use requestHandler directly in the main-module listener instead of
  importing './server.js' which caused TS2307 resolution failure

server.ts

@@ -4,8 +4,13 @@ import {
   isMainModule,
   writeResponseToNodeResponse,
 } from '@angular/ssr/node';
+import { AngularAppEngine } from '@angular/ssr';
 import * as http from 'node:http';
 
+// Enable serving prerendered static HTML from disk. Without this flag the
+// engine falls back to SSR for every route, ignoring the prerendered output.
+AngularAppEngine.ɵallowStaticRouteRender = true;
+
 /**
  * Public routes prerendered at build time (SSG — Static Site Generation).
  * These five routes are compiled to static HTML during `ng build` and
@@ -53,7 +58,7 @@ function getEngine(): AngularNodeAppEngine {
  * as pre-generated static HTML from the build output. All other routes
  * fall back to server-side rendering (SSR) or the fallback 404 handler.
  */
-export default createNodeRequestHandler(async (req, res, next) => {
+const requestHandler = createNodeRequestHandler(async (req, res, next) => {
   try {
     const prerendered = isPrerenderedRoute(req.url || '/');
     if (prerendered) {
@@ -76,11 +81,12 @@ export default createNodeRequestHandler(async (req, res, next) => {
   }
 });
 
+export default requestHandler;
+
 if (isMainModule(import.meta.url)) {
   const httpServer = http.createServer();
   httpServer.on('request', async (req: http.IncomingMessage, res: http.ServerResponse) => {
-    const handler = (await import('./server.js')).default;
-    handler(req, res, () => {
+    requestHandler(req, res, () => {
       res.statusCode = 404;
       res.end('Not Found');
     });