refactor: move studio to frontends workspace

- Move studio from root to frontends/studio/
- Add owner-tools frontend for live blog admin UI
- Add shared ui component library
- Set up npm workspaces for frontends
- Add enhanced code block extension for editor

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontends/owner-tools/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "owner-tools",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "watch": "vite build --watch"
+  },
+  "dependencies": {
+    "@writekit/ui": "*",
+    "@nanostores/react": "^1.0.0",
+    "@unocss/reset": "^66.5.12",
+    "nanostores": "^1.1.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "unocss": "^66.5.12"
+  },
+  "devDependencies": {
+    "@iconify-json/lucide": "^1.2.82",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "@vitejs/plugin-react": "^4.4.0",
+    "typescript": "^5.7.0",
+    "vite": "^6.0.0"
+  }
+}