feat: 添加移动端适配和测试功能

refactor(layout): 优化页脚布局和备案信息展示
feat(constants): 添加ICP备案和公安备案信息
feat(header): 实现移动端加载时的骨架屏效果
style(globals): 调整文字颜色和添加移动端响应样式
feat(breadcrumb): 增加返回按钮和响应式优化
feat(e2e): 添加移动端测试工具和测试用例
docs: 添加页脚重设计文档

src/components/layout/breadcrumb.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import Link from 'next/link';
-import { ChevronRight, Home } from 'lucide-react';
+import { ChevronRight, Home, ArrowLeft } from 'lucide-react';
 
 interface BreadcrumbItem {
   label: string;
@@ -10,20 +10,31 @@ interface BreadcrumbItem {
 
 interface BreadcrumbProps {
   items: BreadcrumbItem[];
+  showBackButton?: boolean;
+  onBackClick?: () => void;
 }
 
-export function Breadcrumb({ items }: BreadcrumbProps) {
+export function Breadcrumb({ items, showBackButton = false, onBackClick }: BreadcrumbProps) {
   return (
-    <nav aria-label="breadcrumb" className="flex items-center space-x-2 text-sm text-[#5C5C5C] py-4">
-      <Link href="/" className="flex items-center hover:text-[#C41E3A] transition-colors">
+    <nav aria-label="breadcrumb" className="flex items-center space-x-2 text-sm text-[#4A4A4A] py-4 px-4 md:px-0">
+      {showBackButton && (
+        <button
+          onClick={onBackClick}
+          className="flex items-center mr-2 hover:text-[#C41E3A] transition-colors focus:outline-none focus:ring-2 focus:ring-[#C41E3A] focus:ring-offset-2"
+          aria-label="返回"
+        >
+          <ArrowLeft className="w-5 h-5" />
+        </button>
+      )}
+      <Link href="/" className="flex items-center hover:text-[#C41E3A] transition-colors focus:outline-none focus:ring-2 focus:ring-[#C41E3A] focus:ring-offset-2 rounded" aria-label="首页">
         <Home className="w-4 h-4" />
       </Link>
       {items.map((item, index) => (
         <div key={index} className="flex items-center">
-          <ChevronRight className="w-4 h-4 text-[#E5E5E5]" />
+          <ChevronRight className="w-4 h-4 text-[#E5E5E5] flex-shrink-0" aria-hidden="true" />
           <Link
             href={item.href}
-            className="ml-2 hover:text-[#C41E3A] transition-colors"
+            className="ml-2 hover:text-[#C41E3A] transition-colors focus:outline-none focus:ring-2 focus:ring-[#C41E3A] focus:ring-offset-2 rounded truncate max-w-[120px] md:max-w-none"
           >
             {item.label}
           </Link>