feat: add caddy config

frontend/vite.config.ts

@@ -3,6 +3,9 @@ import tailwindcss from "@tailwindcss/vite";
 import { defineConfig } from "vite";
 
 const proxyTarget = process.env.API_PROXY_TARGET ?? "http://127.0.0.1:8080";
+const allowedHosts = process.env.ALLOWED_HOSTS
+  ? process.env.ALLOWED_HOSTS.split(",")
+  : undefined;
 
 export default defineConfig({
   plugins: [tailwindcss(), sveltekit()],
@@ -14,6 +17,7 @@ export default defineConfig({
     },
   },
   server: {
+    allowedHosts,
     proxy: {
       "/api": { target: proxyTarget, changeOrigin: true },
       "/mcp": { target: proxyTarget, changeOrigin: true },