fix: 语言切换全面修复 —— 品牌层/主题首页/详情区块/404 全量 i18n（zh 矩阵 13/13）

- 站点品牌双语：每站 brandZh（品牌名/标语/hero/导航/页脚/搜索占位）由生成器写入
  站点 messages 的 zh 覆盖；SiteChrome 改为 async getTranslations 按语言渲染
- 五套主题首页接线 siteHome/hero 命名空间（新增 wire-theme-i18n.py 一次性接线脚本，
  仅处理组件函数体、hook 自动插入、hero 用 th 命名空间）
- 详情页 Use cases/Good for/FAQ/reviewCta、用例与合集索引与详情、提交页、
  对比页、Alternatives 表头与 FAQ 全部走 next-intl
- 404 双语言：locale 内走 next-intl，根级按 Accept-Language
- 修复 zh.json 中 84 处 zhXxx 旁挂键归位 + en.json 残留清理（i18n 694 键一致）
- 回归：/zh 下 13 页全中文无英文残留、无横向溢出；五站 /zh lang=zh 全部正确

sites/the-ai-ledger/src/site/home.tsx

@@ -1,6 +1,7 @@
 // 自动生成：站点首页组件（源自底座 editorial 形态，品牌来自 @/site/brand）
 import { siteConfig } from "@/site/brand";
 import { BookOpen, PenTool, ArrowRight, Star } from "lucide-react";
+import { getTranslations } from "next-intl/server";
 import { LocaleLink } from "@/components/locale-link";
 import { SectionHeader } from "@/kit/section";
 import { getHomeDataSafe } from "@/kit/home-data";
@@ -45,6 +46,8 @@ const footerGroups = [
 ];
 
 async function SiteHome({ locale }: { locale: string }) {
+  const t = await getTranslations("siteHome");
+  const th = await getTranslations("hero");
   const data = await getHomeDataSafe(6);
   const featured = data.articles[0];
   const editorPicks = data.editorsChoice.slice(0, 4);
@@ -55,13 +58,13 @@ async function SiteHome({ locale }: { locale: string }) {
       <section className="border-b border-border">
         <div className="mx-auto max-w-4xl px-4 py-16 text-center sm:px-6 md:py-20">
           <p className="text-xs font-medium uppercase tracking-[0.3em] text-muted-foreground">
-            Independent AI Coverage
+            {t("mastheadLabel")}
           </p>
           <h1 className="mt-4 text-4xl font-bold tracking-tight text-foreground md:text-5xl">
-            {siteConfig.brand.headline}
+            {th("title")}
           </h1>
           <p className="mx-auto mt-4 max-w-xl text-base leading-relaxed text-muted-foreground">
-            {siteConfig.brand.subheadline}
+            {th("description")}
           </p>
         </div>
       </section>
@@ -72,7 +75,7 @@ async function SiteHome({ locale }: { locale: string }) {
           <section>
             <div className="mb-4 flex items-center gap-2 text-xs font-semibold uppercase tracking-widest text-primary">
               <BookOpen className="h-3.5 w-3.5" />
-              Featured story
+              {t("featuredLabel")}
             </div>
             <LocaleLink href={`/blog/${featured.slug}`} className="group block">
               <h2 className="text-2xl font-bold leading-snug text-foreground group-hover:underline md:text-3xl">
@@ -84,7 +87,7 @@ async function SiteHome({ locale }: { locale: string }) {
                 </p>
               )}
               <span className="mt-3 inline-flex items-center gap-1 text-sm font-medium text-primary">
-                Read the story
+                {t("featuredRead")}
                 <ArrowRight className="h-3.5 w-3.5 transition-transform group-hover:translate-x-0.5" />
               </span>
             </LocaleLink>
@@ -96,7 +99,7 @@ async function SiteHome({ locale }: { locale: string }) {
           <section>
             <div className="mb-4 flex items-center gap-2 text-xs font-semibold uppercase tracking-widest text-primary">
               <PenTool className="h-3.5 w-3.5" />
-              Editor's picks
+              {t("picksEditorialLabel")}
             </div>
             <div className="divide-y divide-border border-y border-border">
               {editorPicks.map((tool, i) => (
@@ -132,10 +135,10 @@ async function SiteHome({ locale }: { locale: string }) {
         {data.collections.length > 0 && (
           <section>
             <SectionHeader
-              title="Buying guides"
-              subtitle="Deep dives that help you choose"
+              title={t("guidesTitle")}
+              subtitle={t("guidesSubtitle")}
               viewAllHref="/best"
-              viewAllLabel="All guides"
+              viewAllLabel={t("guidesViewAll")}
             />
             <div className="grid gap-6 sm:grid-cols-2">
               {data.collections.slice(0, 4).map((col) => (
@@ -151,7 +154,7 @@ async function SiteHome({ locale }: { locale: string }) {
                     {locale === "zh" && col.introZh ? col.introZh : col.introEn}
                   </p>
                   <p className="mt-2 text-xs uppercase tracking-wide text-muted-foreground">
-                    {col.toolCount} tools compared
+                    {col.toolCount} {t("toolsCompared")}
                   </p>
                 </LocaleLink>
               ))}
@@ -162,7 +165,7 @@ async function SiteHome({ locale }: { locale: string }) {
         {/* Latest articles */}
         {data.articles.length > 1 && (
           <section>
-            <SectionHeader title="Latest stories" viewAllHref="/blog" />
+            <SectionHeader title={t("storiesTitle")} viewAllHref="/blog" />
             <div className="grid gap-6 sm:grid-cols-2">
               {data.articles.slice(1).map((article) => (
                 <LocaleLink key={article.slug} href={`/blog/${article.slug}`} className="group">
@@ -184,9 +187,9 @@ async function SiteHome({ locale }: { locale: string }) {
         {data.latestReviews.length > 0 && (
           <section>
             <SectionHeader
-              title="From the community"
+              title={t("communityTitle")}
               viewAllHref="/tools"
-              viewAllLabel="Browse directory"
+              viewAllLabel={t("communityViewAll")}
             />
             <div className="grid gap-6 sm:grid-cols-2">
               {data.latestReviews.slice(0, 4).map((review, i) => (