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>

package.json

@@ -1,38 +1,11 @@
 {
-  "name": "ordo-designer-demo",
-  "version": "0.0.0",
+  "name": "ordo-designer-vue-root",
   "private": true,
   "type": "module",
   "scripts": {
-    "dev": "vite",
-    "build": "run-p type-check \"build-only {@}\" --",
-    "preview": "vite preview",
-    "build-only": "vite build",
-    "type-check": "vue-tsc --build"
-  },
-  "dependencies": {
-    "@lucide/vue": "^1.46.0",
-    "@tailwindcss/vite": "^4.3.3",
-    "@vue-flow/background": "^1.3.2",
-    "@vue-flow/controls": "^1.1.3",
-    "@vue-flow/core": "^1.48.2",
-    "@vue-flow/minimap": "^1.5.4",
-    "naive-ui": "^2.45.3",
-    "pinia": "^4.0.2",
-    "tailwindcss": "^4.3.3",
-    "vue": "^3.5.40",
-    "vue-router": "^5.2.0"
-  },
-  "devDependencies": {
-    "@tsconfig/node24": "^24.0.4",
-    "@types/node": "^24.13.3",
-    "@vitejs/plugin-vue": "^6.0.8",
-    "@vue/tsconfig": "^0.9.1",
-    "npm-run-all2": "^9.0.2",
-    "typescript": "~6.0.0",
-    "vite": "^8.1.5",
-    "vite-plugin-vue-devtools": "^8.1.5",
-    "vue-tsc": "^3.3.7"
+    "dev": "pnpm -F ordo-designer-vue build && pnpm -F playground dev",
+    "build": "pnpm -F ordo-designer-vue build && pnpm -F playground build",
+    "type-check": "pnpm -r type-check"
   },
   "engines": {
     "node": "^22.18.0 || >=24.12.0"