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/devai-tools/src/site/home.tsx

@@ -1,6 +1,7 @@
 // 自动生成：站点首页组件（源自底座 niche 形态，品牌来自 @/site/brand）
 import { siteConfig } from "@/site/brand";
 import { Code2, Terminal, Workflow, Layers } from "lucide-react";
+import { getTranslations } from "next-intl/server";
 import { ToolCard } from "@/components/tool-card";
 import { LocaleLink } from "@/components/locale-link";
 import { SectionHeader } from "@/kit/section";
@@ -44,6 +45,8 @@ const footerGroups = [
 ];
 
 async function SiteHome({ locale }: { locale: string }) {
+  const t = await getTranslations("siteHome");
+  const th = await getTranslations("hero");
   const data = await getHomeDataSafe(6);
 
   return (
@@ -65,10 +68,10 @@ async function SiteHome({ locale }: { locale: string }) {
               </p>
               <p className="flex items-center gap-2 text-foreground">
                 <Terminal className="h-3.5 w-3.5 text-emerald-600 dark:text-emerald-400" />
-                {siteConfig.brand.headline}
+                {th("title")}
               </p>
               <p className="text-xs leading-relaxed text-muted-foreground">
-                {siteConfig.brand.subheadline}
+                {th("description")}
               </p>
               <p className="pt-2">
                 <LocaleLink
@@ -88,10 +91,10 @@ async function SiteHome({ locale }: { locale: string }) {
         {data.useCases.length > 0 && (
           <section>
             <SectionHeader
-              title="Ship faster with AI"
-              subtitle="Pick your workflow — we ranked the tools for it"
+              title={t("shipTitle")}
+              subtitle={t("shipSubtitle")}
               viewAllHref="/ai-tools-for"
-              viewAllLabel="All use cases"
+              viewAllLabel={t("useCasesViewAll")}
             />
             <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
               {data.useCases.slice(0, 6).map((uc) => (
@@ -119,7 +122,7 @@ async function SiteHome({ locale }: { locale: string }) {
         {data.trending.length > 0 && (
           <section>
             <SectionHeader
-              title="Most upvoted this week"
+              title={t("upvotedTitle")}
               viewAllHref="/rankings?board=trending"
             />
             <div className="grid gap-3 md:grid-cols-2">
@@ -139,10 +142,10 @@ async function SiteHome({ locale }: { locale: string }) {
         {data.collections.length > 0 && (
           <section>
             <SectionHeader
-              title="Workflows & stacks"
-              subtitle="Batteries-included tool stacks for common dev tasks"
+              title={t("workflowsTitle")}
+              subtitle={t("workflowsSubtitle")}
               viewAllHref="/best"
-              viewAllLabel="All workflows"
+              viewAllLabel={t("workflowsViewAll")}
             />
             <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
               {data.collections.slice(0, 3).map((col) => (
@@ -167,7 +170,7 @@ async function SiteHome({ locale }: { locale: string }) {
         {/* Categories */}
         {data.categories.length > 0 && (
           <section>
-            <SectionHeader title="Browse by category" viewAllHref="/tools" />
+            <SectionHeader title={t("categoriesTitle")} viewAllHref="/tools" />
             <div className="flex flex-wrap gap-2">
               {data.categories.slice(0, 14).map((cat) => (
                 <LocaleLink