refactor(link): 营销页站内链接统一 StaticLink（静态托管适配）+ 删除 0 引用死代码组件 + QA 页 client/server 拆分

src/app/(marketing)/cases/cases-content-v3.tsx

@@ -2,6 +2,7 @@
 
 import { useState, useMemo } from 'react';
 import { motion } from 'framer-motion';
+import { StaticLink } from '@/components/ui/static-link';
 import { Building2, ArrowUpRight, Target, Lightbulb, Filter } from 'lucide-react';
 import {
   type CaseStudy,
@@ -308,19 +309,19 @@ export default function CasesContentV3({
               让我们聊聊您的挑战，看看能创造什么样的成果。
             </p>
             <div className="flex flex-col sm:flex-row gap-4 sm:gap-6">
-              <a
+              <StaticLink
                 href="/contact"
                 className="group inline-flex items-center justify-center gap-3 px-10 py-5 font-semibold text-base bg-brand text-white transition-all duration-300 hover:bg-brand/90 min-h-[52px] touch-manipulation"
               >
                 预约咨询
                 <ArrowUpRight className="w-4 h-4 transition-transform duration-300 group-hover:translate-x-0.5 group-hover:-translate-y-0.5" />
-              </a>
-              <a
+              </StaticLink>
+              <StaticLink
                 href="/services"
                 className="inline-flex items-center justify-center gap-3 px-10 py-5 font-semibold text-base text-ink border border-border-primary hover:border-border-secondary hover:bg-white transition-all duration-300 min-h-[52px] touch-manipulation"
               >
                 了解服务
-              </a>
+              </StaticLink>
             </div>
           </motion.div>
         </div>