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>

tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "noEmit": true,
+    "module": "nodenext",
+    "moduleResolution": "nodenext",
+    "allowImportingTsExtensions": true,
+    "esModuleInterop": true
+  }
+}