chore: sync marketing pages, CMS extensions, tests and project docs

同步工作区剩余变更，主要包括：
- 营销页面组件与布局持续优化（about/news/services/solutions/team 等）
- 详情页四层叙事组件、布局组件、UI 组件调整
- CMS 数据模型、API 路由、权限、工作流、站内通知、媒体管理扩展
- 新增/补充单元测试与 E2E 测试（cms-workflow.spec.ts 等）
- ESLint 9 迁移、jest/tsconfig 配置更新、依赖调整
- 新增 ADR、CMS 评估文档、Release Review / Acceptance 报告
- 移除水墨装饰组件与大体积未使用字体文件

src/app/not-found.tsx

@@ -1,103 +1,10 @@
-'use client';
+import type { Metadata } from 'next';
+import { NotFoundContent } from './not-found-content';
 
-import { useEffect } from 'react';
-import { StaticLink } from '@/components/ui/static-link';
-import { Button } from '@/components/ui/button';
-import { Home, ArrowLeft, Search } from 'lucide-react';
+export const metadata: Metadata = {
+  title: '页面未找到',
+};
 
 export default function NotFound() {
-  useEffect(() => {
-    document.title = '页面未找到 - 睿新致远';
-  }, []);
-
-  return (
-    <div className="min-h-screen bg-[var(--color-bg-primary)] flex items-center justify-center">
-      <div className="container-wide px-4 py-20">
-        <div className="max-w-xl mx-auto text-center">
-          <div className="mb-8">
-            <h1 className="text-8xl sm:text-[120px] font-bold text-[var(--color-brand)] leading-none mb-4 opacity-20">
-              404
-            </h1>
-          </div>
-
-          <h2 className="text-2xl sm:text-3xl font-bold text-[var(--color-text-primary)] mb-4">
-            页面未找到
-          </h2>
-
-          <p className="text-base text-[var(--color-text-muted)] mb-8 leading-relaxed">
-            您访问的页面不存在或已被移动。请检查网址，或返回首页继续浏览。
-          </p>
-
-          <div className="flex flex-col sm:flex-row gap-4 justify-center mb-12">
-            <Button
-              size="lg"
-              asChild
-            >
-              <StaticLink href="/">
-                <Home className="w-5 h-5 mr-2" />
-                返回首页
-              </StaticLink>
-            </Button>
-
-            <Button
-              size="lg"
-              variant="outline"
-              onClick={() => window.history.back()}
-            >
-              <ArrowLeft className="w-5 h-5 mr-2" />
-              返回上一页
-            </Button>
-          </div>
-
-          <div className="bg-[var(--color-bg-section)] rounded-xl p-6 sm:p-8">
-            <h3 className="text-lg font-semibold text-[var(--color-text-primary)] mb-5">
-              您可能在寻找
-            </h3>
-
-            <div className="grid grid-cols-2 gap-3">
-              <StaticLink
-                href="/products"
-                className="flex flex-col items-center p-4 bg-[var(--color-bg-primary)] rounded-lg hover:shadow-md transition-shadow group"
-              >
-                <div className="w-9 h-9 bg-[var(--color-brand-bg)] rounded-lg flex items-center justify-center mb-2 group-hover:bg-[var(--color-challenge-isolation-hover)] transition-colors">
-                  <Search className="w-4 h-4 text-[var(--color-brand)]" />
-                </div>
-                <span className="font-medium text-sm text-[var(--color-text-primary)]">产品</span>
-              </StaticLink>
-
-              <StaticLink
-                href="/solutions"
-                className="flex flex-col items-center p-4 bg-[var(--color-bg-primary)] rounded-lg hover:shadow-md transition-shadow group"
-              >
-                <div className="w-9 h-9 bg-[var(--color-brand-bg)] rounded-lg flex items-center justify-center mb-2 group-hover:bg-[var(--color-challenge-isolation-hover)] transition-colors">
-                  <Search className="w-4 h-4 text-[var(--color-brand)]" />
-                </div>
-                <span className="font-medium text-sm text-[var(--color-text-primary)]">解决方案</span>
-              </StaticLink>
-
-              <StaticLink
-                href="/about"
-                className="flex flex-col items-center p-4 bg-[var(--color-bg-primary)] rounded-lg hover:shadow-md transition-shadow group"
-              >
-                <div className="w-9 h-9 bg-[var(--color-brand-bg)] rounded-lg flex items-center justify-center mb-2 group-hover:bg-[var(--color-challenge-isolation-hover)] transition-colors">
-                  <Search className="w-4 h-4 text-[var(--color-brand)]" />
-                </div>
-                <span className="font-medium text-sm text-[var(--color-text-primary)]">关于我们</span>
-              </StaticLink>
-
-              <StaticLink
-                href="/contact"
-                className="flex flex-col items-center p-4 bg-[var(--color-bg-primary)] rounded-lg hover:shadow-md transition-shadow group"
-              >
-                <div className="w-9 h-9 bg-[var(--color-brand-bg)] rounded-lg flex items-center justify-center mb-2 group-hover:bg-[var(--color-challenge-isolation-hover)] transition-colors">
-                  <Search className="w-4 h-4 text-[var(--color-brand)]" />
-                </div>
-                <span className="font-medium text-sm text-[var(--color-text-primary)]">联系我们</span>
-              </StaticLink>
-            </div>
-          </div>
-        </div>
-      </div>
-    </div>
-  );
+  return <NotFoundContent />;
 }