chore: monorepo scaffold and shared config

Workspace setup with pnpm, Vite+, and shared TypeScript config.
Includes @vue-tui/utils and AGENTS.md project conventions.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "vue-tui",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "ready": "vp check && vp run -r test && vp run -r build",
+    "dev": "vp run website#dev",
+    "prepare": "vp config"
+  },
+  "devDependencies": {
+    "vite-plus": "catalog:"
+  },
+  "engines": {
+    "node": ">=22.12.0"
+  },
+  "packageManager": "pnpm@11.1.2"
+}