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/components/sections/case-card.tsx

@@ -48,14 +48,11 @@ export function CaseCard({
     >
       {/* Background image */}
       {image && (
-        <div className="absolute inset-0 transition-opacity duration-500 opacity-[0.02] group-hover:opacity-[0.05]">
-          <img
-            src={image}
-            alt=""
-            className="w-full h-full object-cover"
-            loading="lazy"
-          />
-        </div>
+        <div
+          aria-hidden="true"
+          style={{ backgroundImage: `url(${image})` }}
+          className="absolute inset-0 bg-cover bg-center transition-opacity duration-500 opacity-[0.02] group-hover:opacity-[0.05]"
+        />
       )}
 
       <div className="relative z-10 flex flex-col flex-1">

src/components/sections/case-detail-page.tsx

@@ -3,6 +3,7 @@
 import { motion, useScroll, useTransform } from 'framer-motion';
 import { useRef, useState, useEffect } from 'react';
 import { ScrollReveal, StaggerReveal } from '@/components/ui/scroll-reveal';
+import { StaticLink } from '@/components/ui/static-link';
 import { SectionHeader } from '@/components/sections/section-header';
 import { ServiceCard } from '@/components/sections/service-card';
 import { ScrollProgress } from '@/components/ui/scroll-progress';
@@ -175,10 +176,10 @@ function CaseDetailHero({ data }: CaseDetailHeroProps) {
           transition={{ duration: 0.8, delay: 0.8, ease: EASE }}
         >
           <Button size="lg" asChild>
-            <a href="/contact">
+            <StaticLink href="/contact">
               咨询类似方案
               <ArrowRight className="w-4 h-4 ml-2" />
-            </a>
+            </StaticLink>
           </Button>
           <Button size="lg" variant="outline" asChild>
             <a href="#solution">查看方案</a>
@@ -512,13 +513,13 @@ function CTASection() {
           </p>
           <div className="flex flex-col sm:flex-row justify-center gap-4">
             <Button size="lg" asChild>
-              <a href="/contact">
+              <StaticLink href="/contact">
                 免费咨询
                 <ArrowRight className="w-4 h-4 ml-2" />
-              </a>
+              </StaticLink>
             </Button>
             <Button size="lg" variant="outline" asChild>
-              <a href="/cases">查看更多案例</a>
+              <StaticLink href="/cases">查看更多案例</StaticLink>
             </Button>
           </div>
         </ScrollReveal>

src/components/sections/insight-card.tsx

@@ -38,11 +38,10 @@ export function InsightCard({
       >
         {/* Background image */}
         {image && (
-          <img
-            src={image}
-            alt=""
-            className="absolute inset-0 w-full h-full object-cover transition-transform duration-700 group-hover:scale-105 opacity-10"
-            loading="lazy"
+          <div
+            aria-hidden="true"
+            style={{ backgroundImage: `url(${image})` }}
+            className="absolute inset-0 bg-cover bg-center transition-transform duration-700 group-hover:scale-105 opacity-10"
           />
         )}
 

src/components/sections/why-us-section.tsx

@@ -174,7 +174,7 @@ export function WhyUsSection() {
                     {tech.abbr}
                   </span>
                 </div>
-                <span className="text-[10px] text-[var(--color-text-hint)]">{tech.name}</span>
+                <span className="text-[10px] text-[var(--color-text-muted)]">{tech.name}</span>
               </div>
             ))}
           </div>