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)/about/brand/brand-content.tsx

@@ -2,6 +2,7 @@
 
 import { motion } from 'framer-motion';
 import { ScrollReveal } from '@/components/ui/scroll-reveal';
+import { StaticLink } from '@/components/ui/static-link';
 import { BrandCalligraphyName } from '@/components/ui/brand-calligraphy-name';
 import {
   ArrowRight,
@@ -355,20 +356,20 @@ export default function BrandContent() {
               从一次深入的业务诊断开始，开启您的数据驱动之旅。
             </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]"
               >
                 预约咨询
                 <ArrowRight className="w-5 h-5 transition-transform duration-300 group-hover:translate-x-1" />
-              </a>
-              <a
+              </StaticLink>
+              <StaticLink
                 href="/cases"
                 className="group inline-flex items-center justify-center gap-2 px-10 py-5 font-semibold text-base text-dark-text-primary border border-dark-border hover:border-dark-text-muted transition-all duration-300 min-h-[52px]"
               >
                 查看客户案例
                 <ChevronRight className="w-4 h-4 transition-transform duration-300 group-hover:translate-x-1" />
-              </a>
+              </StaticLink>
             </div>
           </ScrollReveal>
         </div>