feat: split Ordo designer into library monorepo

Extract ordo-designer-vue package with shadcn UI and context-based state; add playground app, library-api docs, and README.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/playground/vite.config.ts

@@ -0,0 +1,29 @@
+import path from 'node:path'
+import { fileURLToPath, URL } from 'node:url'
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import vueDevTools from 'vite-plugin-vue-devtools'
+import tailwindcss from '@tailwindcss/vite'
+
+const pkgDist = fileURLToPath(new URL('../../packages/ordo-designer-vue/dist/ordo-designer-vue.js', import.meta.url))
+const pkgStyle = fileURLToPath(new URL('../../packages/ordo-designer-vue/dist/style.css', import.meta.url))
+
+export default defineConfig({
+  plugins: [vue(), vueDevTools(), tailwindcss()],
+  resolve: {
+    alias: [
+      { find: '@', replacement: fileURLToPath(new URL('./src', import.meta.url)) },
+      { find: 'ordo-designer-vue/style.css', replacement: pkgStyle },
+      // Exact entry only — avoid breaking `ordo-designer-vue/style.css` subpath.
+      { find: /^ordo-designer-vue$/, replacement: pkgDist },
+    ],
+  },
+  server: {
+    proxy: {
+      '/ordo': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
+      },
+    },
+  },
+})