refactor(ui): switch remaining raw CTA pills to CTAButton across 5 pages

- about/contact 补 CTAButton import，移除变 unused 的 ArrowUpRight/ArrowRight

- products/standalone 次链接 StaticLink → CTAButton secondary

- 统一品牌 ArrowRight 签名与 200-300ms 过渡，保留原始尺寸

src/app/(marketing)/services/service-detail-content-v4.tsx

@@ -84,12 +84,9 @@ function DetailHero({ service }: { service: Service }) {
             <CTAButton href="/contact" dataTestId="service-detail-hero-primary" className="min-h-[52px]">
               免费咨询
             </CTAButton>
-            <a
-              href="#cases"
-              className="inline-flex items-center justify-center gap-3 px-10 py-5 font-semibold text-base text-ink border border-border-primary rounded-full hover:border-ink/30 transition-all duration-300 min-h-[52px] touch-manipulation"
-            >
+            <CTAButton href="#cases" variant="secondary" className="min-h-[52px] touch-manipulation">
               查看案例
-            </a>
+            </CTAButton>
           </motion.div>
         </div>
       </div>