fix(frontend): add vite preview allowedHosts and port config

Vite preview blocks unknown hosts by default. Added allowedHosts for
imphnen.asepharyana.my.id and set port/host in preview config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

services/frontend/vite.config.ts

@@ -13,4 +13,9 @@ export default defineConfig({
   server: {
     middlewareMode: false,
   },
+  preview: {
+    port: 3000,
+    host: true,
+    allowedHosts: ["imphnen.asepharyana.my.id", "imphnen.asepharyana.tech", "imphnen.asepharyana.web.id"],
+  },
 });