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/vite.config.ts

@@ -0,0 +1,42 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import UnoCSS from 'unocss/vite'
+import { resolve } from 'path'
+
+export default defineConfig(({ command }) => ({
+  plugins: [UnoCSS(), ...(command === 'build' ? [react()] : [])],
+  base: command === 'serve' ? '/@owner-tools' : '/',
+  esbuild: {
+    jsxInject: `import React from 'react'`
+  },
+
+  ...(command === 'serve' && {
+    server: {
+      host: true,
+      port: 5174,
+      strictPort: true,
+      allowedHosts: true,
+      hmr: {
+        clientPort: 80,
+        path: '/@owner-tools'
+      },
+      proxy: {
+        '/api/studio': {
+          target: 'http://app:8080',
+          changeOrigin: true
+        }
+      }
+    }
+  }),
+
+  build: {
+    lib: {
+      entry: resolve(__dirname, 'src/main.tsx'),
+      name: 'OwnerTools',
+      formats: ['iife'],
+      fileName: () => 'owner-tools.js'
+    },
+    outDir: '../../internal/build/assets/js',
+    emptyOutDir: false
+  }
+}))