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/studio/vite.config.ts

@@ -0,0 +1,47 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import UnoCSS from 'unocss/vite'
+
+export default defineConfig(({ command }) => ({
+  plugins: [UnoCSS(), react()],
+  base: '/studio',
+  build: {
+    outDir: 'dist',
+  },
+  optimizeDeps: {
+    include: [
+      // Pre-bundle heavy Tiptap dependencies
+      '@tiptap/react',
+      '@tiptap/starter-kit',
+      '@tiptap/extension-link',
+      '@tiptap/extension-image',
+      '@tiptap/extension-placeholder',
+      '@tiptap/extension-table',
+      '@tiptap/extension-task-list',
+      '@tiptap/extension-task-item',
+      '@tiptap/extension-code-block-lowlight',
+      '@tiptap/markdown',
+      'lowlight',
+      // Monaco editor
+      '@monaco-editor/react',
+    ],
+  },
+  ...(command === 'serve' && {
+    server: {
+      host: true,
+      strictPort: true,
+      allowedHosts: true,
+      hmr: {
+        clientPort: 80,
+        path: '/studio',
+      },
+      warmup: {
+        clientFiles: [
+          './src/components/editor/PostEditor.tsx',
+          './src/components/editor/SourceEditor.tsx',
+          './src/pages/PostEditorPage.tsx',
+        ],
+      },
+    },
+  }),
+}))