fix: convert solutions and cases pages to client components

src/app/(marketing)/cases/page.tsx

@@ -1,15 +1,11 @@
-import { Metadata } from 'next';
+'use client';
+
 import Link from 'next/link';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
 import { ArrowRight, Building2, Calendar, TrendingUp } from 'lucide-react';
 import { CASES } from '@/lib/constants';
 
-export const metadata: Metadata = {
-  title: '客户案例 - 睿新致远',
-  description: '与谁同行，决定能走多远',
-};
-
 export default function CasesPage() {
   return (
     <div className="min-h-screen bg-white">