feat(web): 搭建 Web 壳层与 UI 包基线

React 19 + Vite 6 + Router 7 + TanStack Query + Zustand；Semi 二次封装与 Remix 图标统一出口；顶部模块 + 左侧功能菜单布局、Cloud Blue 主题、登录页与 401/403/404/500 页面；请求层含 token 注入、单飞刷新与统一错误提示。

apps/web/src/layout/PageBreadcrumbs.tsx

@@ -0,0 +1,33 @@
+import type { ReactNode } from 'react';
+import { Link } from 'react-router';
+
+import { getBreadcrumbs, NAV_MODULES } from '@/navigation/nav-config';
+
+export interface PageBreadcrumbsProps {
+  pathname: string;
+}
+
+export function PageBreadcrumbs({ pathname }: PageBreadcrumbsProps): ReactNode {
+  const entries = getBreadcrumbs(NAV_MODULES, pathname);
+  return (
+    <nav className="lx-breadcrumbs" aria-label="面包屑">
+      {entries.map((entry, index) => {
+        const isLast = index === entries.length - 1;
+        return (
+          <span key={entry.key} className="lx-breadcrumbs__entry">
+            {index > 0 ? <span className="lx-breadcrumbs__sep">/</span> : null}
+            {entry.path !== undefined && !isLast ? (
+              <Link to={entry.path} className="lx-breadcrumbs__link">
+                {entry.label}
+              </Link>
+            ) : (
+              <span className={isLast ? 'lx-breadcrumbs__current' : 'lx-breadcrumbs__label'}>
+                {entry.label}
+              </span>
+            )}
+          </span>
+        );
+      })}
+    </nav>
+  );
+}