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/findai/src/app/[locale]/not-found.tsx

@@ -0,0 +1,2 @@
+// 自动生成：[locale]/not-found.tsx 的薄路由
+export { default } from "@aidir/core/pages/[locale]/not-found";

sites/findai/src/i18n/request.ts

@@ -6,13 +6,25 @@ import { locales, defaultLocale, type Locale } from "@aidir/core/i18n.config";
 const brandMessages = {
   en: {
     seo: { home: {"title":"findai — The Minimal AI Tool Search Engine","description":"One search box, every AI tool. Describe what you're trying to do and find the right AI tool, ranked by the community.","ogImage":"/og-image.png"} },
-    hero: { title: "findai — The Minimal AI Tool Search Engine", description: "One search box, every AI tool. Describe what you're trying to do and find the right AI tool, ranked by the community." },
+    hero: { title: "What are you trying to do?", description: "One search box, every AI tool. Describe what you're trying to do and find the right AI tool, ranked by the community." },
     common: { brand: { name: "findai", tagline: "The minimal AI tool search engine." } },
+    navigation: {
+      main: { tools: "Search", blog: "Blog" },
+      site: { items: ["Search","Use Cases","Rankings","Submit"], hrefs: ["/tools","/ai-tools-for","/rankings","/submit"] },
+    },
+    siteFooter: { groups: [{"title":"Search","links":[{"label":"All Tools","href":"/tools"},{"label":"Use Cases","href":"/ai-tools-for"},{"label":"Rankings","href":"/rankings"}]},{"title":"About","links":[{"label":"Submit a Tool","href":"/submit"},{"label":"Privacy","href":"/privacy"},{"label":"Terms","href":"/terms"}]}] },
+    siteHeader: { searchPlaceholder: "What do you need?" },
   },
   zh: {
     seo: { home: {"title":"findai — 极简 AI 工具搜索引擎","description":"一个搜索框，找遍全部 AI 工具。说出你想做的事，社区排名替你选。","ogImage":"/og-image.png"} },
-    hero: { title: "findai — 极简 AI 工具搜索引擎", description: "一个搜索框，找遍全部 AI 工具。说出你想做的事，社区排名替你选。" },
-    common: { brand: { name: "findai", tagline: "The minimal AI tool search engine." } },
+    hero: { title: "你想完成什么？", description: "一个搜索框，找遍全部 AI 工具。说出你想做的事，社区排名替你选。" },
+    common: { brand: { name: "findai", tagline: "极简 AI 工具搜索引擎。" } },
+    navigation: {
+      main: { tools: "搜索", blog: "博客" },
+      site: { items: ["搜索","用例","排行榜","提交"], hrefs: ["/tools","/ai-tools-for","/rankings","/submit"] },
+    },
+    siteFooter: { groups: [{"title":"搜索","links":[{"label":"All Tools","href":"/tools"},{"label":"Use Cases","href":"/ai-tools-for"},{"label":"Rankings","href":"/rankings"}]},{"title":"关于","links":[{"label":"Submit a Tool","href":"/submit"},{"label":"Privacy","href":"/privacy"},{"label":"Terms","href":"/terms"}]}] },
+    siteHeader: { searchPlaceholder: "你需要什么？" },
   },
 } as const;
 

sites/findai/src/site/brand.tsx

@@ -2,6 +2,23 @@ import type { SiteConfig } from "@/kit/types";
 
 // findai —— 独立站点的全部品牌/导航/页脚配置
 export const siteConfig: SiteConfig = {
+  "brandZh": {
+    "name": "findai",
+    "tagline": "极简 AI 工具搜索引擎。",
+    "headline": "你想完成什么？",
+    "subheadline": "",
+    "nav": [
+      "搜索",
+      "用例",
+      "排行榜",
+      "提交"
+    ],
+    "footer": [
+      "搜索",
+      "关于"
+    ],
+    "searchPlaceholder": "你需要什么？"
+  },
   "accent": "260 70% 52%",
   "port": 3005,
   "brand": {

sites/findai/src/site/home.tsx

@@ -1,6 +1,7 @@
 // 自动生成：站点首页组件（源自底座 minimal 形态，品牌来自 @/site/brand）
 import { siteConfig } from "@/site/brand";
 import { Search } from "lucide-react";
+import { getTranslations } from "next-intl/server";
 import { ToolCardGrid } from "@/components/tool-card";
 import { LocaleLink } from "@/components/locale-link";
 import { getHomeDataSafe } from "@/kit/home-data";
@@ -44,6 +45,8 @@ const popularSearches = [
 ];
 
 async function SiteHome({ locale }: { locale: string }) {
+  const t = await getTranslations("siteHome");
+  const th = await getTranslations("hero");
   const data = await getHomeDataSafe(6);
 
   return (
@@ -63,7 +66,7 @@ async function SiteHome({ locale }: { locale: string }) {
             <input
               name="search"
               autoFocus
-              placeholder="I need to create marketing videos..."
+              placeholder={t("minimalPlaceholder")}
               className="h-14 w-full rounded-full border border-border bg-background pl-14 pr-6 text-base text-foreground shadow-lg shadow-black/[0.03] placeholder:text-muted-foreground focus:border-primary/50 focus:outline-none focus:ring-4 focus:ring-primary/10"
               aria-label="Search AI tools"
             />
@@ -95,7 +98,7 @@ async function SiteHome({ locale }: { locale: string }) {
               href="/rankings"
               className="text-xs font-medium text-muted-foreground hover:text-primary"
             >
-              See full rankings
+              {t("seeRankings")}
             </LocaleLink>
           </div>
         </section>