Add Craft.js site builder (v2) - complete rebuild from GrapesJS

Rebuilt the visual site builder from scratch using Craft.js, React 18,
and TypeScript. The new editor renders directly in the DOM (no iframe),
supports 40+ components, multi-page with shared header/footer, 16
templates, full-spectrum color/gradient controls, custom head code
injection, save/publish workflow, and auto-save.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

craft/vite.config.ts

@@ -0,0 +1,30 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import path from 'path'
+
+export default defineConfig({
+  plugins: [react()],
+  base: './',
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+  build: {
+    outDir: 'dist',
+    rollupOptions: {
+      output: {
+        entryFileNames: 'js/editor.js',
+        chunkFileNames: 'js/[name].js',
+        assetFileNames: (info) =>
+          info.name?.endsWith('.css') ? 'css/editor.css' : 'assets/[name][extname]',
+      },
+    },
+  },
+  server: {
+    port: 5173,
+    proxy: {
+      '/api': 'http://192.168.1.105:8080',
+    },
+  },
+})