feat: Initial prototype

vendor/README.md

@@ -0,0 +1,10 @@
+# Vendored assets
+
+`figlet.js` and `../fonts/figlet/*.flf` come from the npm package
+[`figlet@1.8.2`](https://www.npmjs.com/package/figlet/v/1.8.2), maintained at
+https://github.com/patorjk/figlet.js. The only code change adds an ES module
+default export. Its MIT license is retained as `figlet.LICENSE`. Font files
+retain their embedded authorship and license notices unchanged.
+
+No CDN or npm installation is needed at runtime. Font data is loaded locally
+when selected and saved in a separate browser cache for later offline use.