feat(website): 更新官网至 v0.7.12 并去 AI 味改版

- 版本号/下载链接模板化（VERSION 单点维护），changelog 增 v0.7.12 条目
- 数据修正：模型库 5910 → 7495 / 供应商 212，JSON-LD softwareVersion 同步
- 文案重写：清除一键/开箱即用/一目了然等八股措辞（中英 ~50 处），
  改为具体可验证的说法；英文标题 sentence case
- 视觉降 AI 感：删网格底纹与光晕、主色降饱和、Download 三等宽卡改
  Windows 主推不对称布局、Privacy 改单面板、Features 双列错落
- gh-pages 已随本次改动重新部署

website/src/components/Footer.tsx

@@ -87,7 +87,7 @@ export default function Footer() {
                   href={link.url}
                   target="_blank"
                   rel="noreferrer"
-                  className="group flex items-start gap-3 rounded-2xl border border-border bg-card p-4 transition-all duration-200 hover:-translate-y-0.5 hover:border-primary/40"
+                  className="group flex items-start gap-3 rounded-xl border border-border bg-card p-4 transition-all duration-200 hover:-translate-y-0.5 hover:border-primary/40"
                   style={{ boxShadow: "var(--shadow-soft)" }}
                 >
                   <div className="flex h-10 w-10 shrink-0 items-center justify-center overflow-hidden rounded-xl border border-border bg-white">

website/src/components/Nav.tsx

@@ -24,7 +24,9 @@ export default function Nav() {
           />
           <span>Kimi Switch</span>
         </NavLink>
-        <nav className="flex items-center gap-5 overflow-x-auto overflow-y-hidden text-sm text-muted-foreground [scrollbar-width:none] [&::-webkit-scrollbar]:hidden">
+        <nav
+          aria-label="Primary"
+          className="flex items-center gap-5 overflow-x-auto overflow-y-hidden text-sm text-muted-foreground [scrollbar-width:none] [&::-webkit-scrollbar]:hidden">
           {links.map((l) => (
             <NavLink
               key={l.to}

website/src/components/SectionShell.tsx

@@ -15,7 +15,7 @@ export default function SectionShell({ id, title, subtitle, children }: SectionS
       ref={ref}
       id={id}
       aria-labelledby={`${id}-title`}
-      className={`py-20 transition-all duration-700 ease-out ${
+      className={`pt-16 pb-20 transition-all duration-700 ease-out ${
         inView
           ? "motion-safe:opacity-100 motion-safe:translate-y-0"
           : "motion-safe:opacity-0 motion-safe:translate-y-6"
@@ -30,7 +30,9 @@ export default function SectionShell({ id, title, subtitle, children }: SectionS
             {title}
           </h2>
           {subtitle && (
-            <p className="mt-3 text-base leading-relaxed text-muted-foreground">{subtitle}</p>
+            <p className="mt-3 max-w-[68ch] text-base leading-relaxed text-muted-foreground">
+              {subtitle}
+            </p>
           )}
         </div>
         {children}