Add ONE-OS Web legacy prototypes and sidebar menu folder.

Import desktop web originals into dedicated prototypes with a shared legacy shell, sync script, and a new「ONE-OS Web 端」sidebar section for review alongside existing refactored pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/common/oneosWebLegacy/legacyGlobals.ts

@@ -0,0 +1,18 @@
+import * as React from 'react';
+import * as ReactDOM from 'react-dom';
+import * as antd from 'antd';
+
+declare global {
+  interface Window {
+    React: typeof React;
+    ReactDOM: typeof ReactDOM;
+    antd: typeof antd;
+  }
+}
+
+export function ensureOneosWebLegacyGlobals(): void {
+  if (typeof window === 'undefined') return;
+  window.React = React;
+  window.ReactDOM = ReactDOM;
+  window.antd = antd;
+}