refactor(ui): 优化导航组件和页面布局

- 移除多个页面的面包屑导航组件
- 添加统一的返回按钮组件替代各页面独立实现
- 优化导航栏滚动检测逻辑和动画效果
- 更新常量类型定义和统计数据
- 调整动态导入的SSR配置为false
- 添加FlipClock组件展示公司运营时长
- 优化新闻列表页的类型安全和响应式设计

src/app/(marketing)/cases/[id]/client.tsx

@@ -1,12 +1,11 @@
 'use client';
 
 import { useEffect, useRef, useState } from 'react';
-import { useRouter } from 'next/navigation';
 import Link from 'next/link';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
-import { Breadcrumb } from '@/components/layout/breadcrumb';
-import { ArrowLeft, CheckCircle2, TrendingUp, Users, Target, Quote, Clock, MessageCircle, Award } from 'lucide-react';
+import { BackButton } from '@/components/ui/back-button';
+import { CheckCircle2, TrendingUp, Users, Target, Quote, Clock, MessageCircle, Award } from 'lucide-react';
 import { CASES } from '@/lib/constants';
 import type { StaticImageData } from 'next/image';
 
@@ -33,7 +32,6 @@ interface CaseDetailClientProps {
 export function CaseDetailClient({ caseItem }: CaseDetailClientProps) {
   const [isVisible, setIsVisible] = useState(false);
   const contentRef = useRef<HTMLDivElement>(null);
-  const router = useRouter();
 
   useEffect(() => {
     const observer = new IntersectionObserver(
@@ -68,18 +66,9 @@ export function CaseDetailClient({ caseItem }: CaseDetailClientProps) {
 
   return (
     <main className="min-h-screen bg-white">
-      <Breadcrumb items={[{ label: '成功案例', href: '/cases' }, { label: caseItem.title, href: `/cases/${caseItem.id}` }]} />
       <div className="relative overflow-hidden bg-gradient-to-b from-[#FAFAFA] to-white">
         <div className="container-wide relative z-10 pt-32 pb-20">
-          <Button 
-            variant="ghost" 
-            className="text-[#5C5C5C] hover:text-[#C41E3A] hover:bg-[#C41E3A]/10"
-            onClick={() => router.back()}
-            type="button"
-          >
-            <ArrowLeft className="w-4 h-4 mr-2" />
-            返回
-          </Button>
+          <BackButton />
           <div className="max-w-4xl mt-8">
             <Badge className="mb-4 bg-[#C41E3A]/10 text-[#C41E3A] hover:bg-[#C41E3A]/20">
               {caseItem.industry}