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>

studio/package.json

@@ -1,49 +0,0 @@
-{
-  "name": "writekit-studio",
-  "private": true,
-  "version": "0.0.1",
-  "type": "module",
-  "scripts": {
-    "dev": "vite",
-    "build": "tsc --noEmit && vite build",
-    "preview": "vite preview",
-    "typecheck": "tsc --noEmit"
-  },
-  "dependencies": {
-    "@iconify-json/logos": "^1.2.10",
-    "@iconify-json/lucide": "^1.2.82",
-    "@monaco-editor/react": "^4.7.0",
-    "@nanostores/query": "^0.3.4",
-    "@nanostores/react": "^1.0.0",
-    "@nanostores/router": "^1.0.0",
-    "@tiptap/extension-code-block-lowlight": "^3.15.1",
-    "@tiptap/extension-image": "^3.15.1",
-    "@tiptap/extension-link": "^3.15.1",
-    "@tiptap/extension-placeholder": "^3.15.1",
-    "@tiptap/extension-table": "^3.15.1",
-    "@tiptap/extension-task-item": "^3.15.1",
-    "@tiptap/extension-task-list": "^3.15.1",
-    "@tiptap/markdown": "^3.15.1",
-    "@tiptap/pm": "^3.15.1",
-    "@tiptap/react": "^3.15.1",
-    "@tiptap/starter-kit": "^3.15.1",
-    "@tiptap/suggestion": "^3.15.2",
-    "@unocss/reset": "^66.5.12",
-    "chart.js": "^4.5.1",
-    "lowlight": "^3.3.0",
-    "monaco-editor": "^0.55.1",
-    "nanostores": "^1.1.0",
-    "react": "^19.0.0",
-    "react-dom": "^19.0.0",
-    "tippy.js": "^6.3.7",
-    "unocss": "^66.5.12"
-  },
-  "devDependencies": {
-    "@iconify-json/simple-icons": "^1.2.65",
-    "@types/react": "^19.0.0",
-    "@types/react-dom": "^19.0.0",
-    "@vitejs/plugin-react": "^5.1.0",
-    "typescript": "^5.7.0",
-    "vite": "^7.3.0"
-  }
-}