fix: add allowedHosts configuration in vite.config.ts

Co-authored-by: Copilot <copilot@github.com>

charactergarden/frontend/vite.config.ts

@@ -4,6 +4,7 @@ import react from "@vitejs/plugin-react";
 export default defineConfig({
   plugins: [react()],
   server: {
+    allowedHosts: "all",
     host: "0.0.0.0",
     port: 5173,
     proxy: {