chore: optimize package.json descriptions for npm discoverability

Improve descriptions across all packages to include key differentiators
(Yoga flexbox, AI agent, React Ink lineage) and rename workspace root
from vue-tui to vue-tui-monorepo to avoid confusion with the taken npm name.

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

package.json

@@ -1,7 +1,8 @@
 {
-  "name": "vue-tui",
+  "name": "vue-tui-monorepo",
   "version": "0.0.0",
   "private": true,
+  "description": "Vue 3 terminal UI framework. Build AI agent interfaces and TUI apps with Yoga flexbox.",
   "type": "module",
   "scripts": {
     "ready": "vp check && vp run -r test && vp run -r build && cd packages/runtime-tests && pnpm pty-test",