feat: Add vite.config.ts with allowedHosts

- Configure Vite preview server to allow all hosts
- Fixes 403 Forbidden error on Easypanel
- Allows dynamic hostnames from Easypanel proxy
- Safe because container is behind proxy

vite.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  server: {
+    host: '0.0.0.0',
+    allowedHosts: true
+  },
+  preview: {
+    host: '0.0.0.0',
+    allowedHosts: true
+  }
+});