docs: README for the blueprint structure; drop standalone-UI sections

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ui/vite.config.ts

@@ -1,16 +0,0 @@
-import tailwindcss from "@tailwindcss/vite";
-import react from "@vitejs/plugin-react";
-import { defineConfig } from "vite";
-
-// `base: "./"` (relative asset URLs) + hash routing is the plugin-ui-surface §6 contract: the SPA is
-// mounted under `/plugin-ui/rom-manager/` behind the console proxy. Tailwind v4 + @unom/ui give it the
-// same look as the console. Built into `../dist/ui`, which `servePluginUi`'s staticDir points at.
-export default defineConfig({
-	base: "./",
-	plugins: [react(), tailwindcss()],
-	build: {
-		outDir: "../dist/ui",
-		emptyOutDir: true,
-	},
-	server: { port: 5599 },
-});