feat(caddy,stand,smoke): prod-like routing stand, api smoke, old ui fallback for unknown paths

vite.config.ts

@@ -3,7 +3,7 @@ import { sveltekit } from "@sveltejs/kit/vite";
 import { vitePreprocess } from "@sveltejs/vite-plugin-svelte";
 import tailwindcss from "@tailwindcss/vite";
 import { defineConfig, loadEnv } from "vite";
-import { isSpaPath } from "./src/lib/spa-paths";
+import { isSpaPath } from "./src/lib/spa-paths.ts";
 
 const allowedHosts = process.env.ALLOWED_HOSTS
   ? process.env.ALLOWED_HOSTS.split(",")