prod için Allowed_Host eklendi.

frontend/vite.config.ts

@@ -1,10 +1,13 @@
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 
+const allowedHosts = process.env.ALLOWED_HOSTS?.split(",").map((h) => h.trim()).filter(Boolean);
+
 export default defineConfig({
   plugins: [react()],
   server: {
     port: 5173,
-    host: true
+    host: true,
+    ...(allowedHosts?.length ? { allowedHosts } : {})
   }
 });